Carotid Stenosis

Complex MONDO:0001612 Pathograph 10 Carotid artery disorder Vascular disorder Cerebrovascular Disease

Carotid stenosis is narrowing of the extracranial carotid arterial lumen, most often involving the carotid bifurcation or internal carotid artery and most commonly caused by atherosclerotic plaque. Disease severity is not only a function of percent narrowing: vulnerable plaque features, superimposed thrombosis, embolization, and reduced cerebral or retinal perfusion determine the risk of transient ischemic attack, amaurosis fugax, ischemic stroke, and hemodynamic cognitive effects.

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5
Pathophys.
1
Histopath.
5
Phenotypes
10
Pathograph
3
Treatments
3
Trials
11
References
1
Deep Research
⚙

Pathophysiology

5
Atherosclerotic carotid plaque formation
Endothelial dysfunction, lipid retention, foam-cell accumulation, vascular smooth-muscle remodeling, and inflammatory extracellular-matrix remodeling form atherosclerotic plaque in the carotid arterial wall and progressively narrow the lumen.
endothelial cell link vascular smooth muscle cell link foam cell link macrophage link
inflammatory response link ↑ INCREASED extracellular matrix organization link ⚠ ABNORMAL
Downstream
Flow-limiting carotid lumen narrowing Plaque growth encroaches on the lumen and creates measurable carotid stenosis.
Show evidence (1 reference)
PMID:37303351 SUPPORT Human Clinical
"CS is seen undergoing almost the same pathogenesis of any atherosclerotic plaque formation, from endothelial damage of the artery lumen to the formation of a fibrous cap with a foam cell, lipid-filled core."
This abstract directly supports endothelial damage, fibrous cap formation, foam cells, and lipid core formation in carotid stenosis.
Flow-limiting carotid lumen narrowing
Plaque burden at the carotid bifurcation or internal carotid artery narrows the arterial lumen and creates a graded stenotic lesion assessed by vascular imaging.
blood vessel remodeling link ⚠ ABNORMAL
internal carotid artery link
Downstream
Vulnerable plaque instability Stenotic plaques can acquire high-risk structural and molecular features that increase embolic risk.
Hemodynamic cerebral perfusion impairment High-grade stenosis can reduce ipsilateral cerebral perfusion reserve in a subset of patients.
Show evidence (1 reference)
DOI:10.1136/jnis-2022-018732 SUPPORT Human Clinical
"Carotid artery stenosis is a leading cause of ischemic stroke."
This review supports carotid artery stenosis as the disease-defining vascular lesion and clinically important stroke-risk condition.
Vulnerable plaque instability
Vulnerable carotid plaques contain lipid-rich necrotic cores, thin fibrous caps, intraplaque hemorrhage, ulceration, neovascularization, inflammatory mediators, oxidized LDL, and proteolytic enzymes that weaken the fibrous cap and increase rupture or embolization risk, including in some non-severe stenoses.
macrophage link endothelial cell link vascular smooth muscle cell link
leukocyte migration link ↑ INCREASED extracellular matrix disassembly link ↑ INCREASED response to oxidative stress link ↑ INCREASED
Downstream
Thromboembolic cerebral and retinal ischemia Plaque rupture, ulceration, and thrombogenicity can generate emboli or local thrombosis.
Show evidence (2 references)
DOI:10.3390/ijms25084351 SUPPORT Human Clinical
"In macroscopic evaluation, vulnerable plaques are characterized by one or more of the following features: microcalcification; neovascularization; lipid-rich necrotic cores (LRNCs); intraplaque hemorrhage (IPH); thin fibrous caps; plaque surface ulceration; huge dimensions, suggesting stenosis;..."
This directly supports vulnerable plaque structural features relevant to carotid stenosis risk stratification.
DOI:10.3390/ijms25084351 SUPPORT Human Clinical
"Inflammatory biomarkers, such as cytokines and adhesion molecules, lipid-related markers like oxidized low-density lipoprotein (LDL), and proteolytic enzymes capable of degrading extracellular matrix components are among the key molecules that are scrutinized for their associative roles in..."
This supports inflammatory, oxidized-lipid, and extracellular-matrix degradation mechanisms in vulnerable plaques.
Thromboembolic cerebral and retinal ischemia
Unstable plaque, superimposed thrombosis, platelet activation, and reduced perfusion reserve can cause transient or permanent ischemia in ipsilateral retinal and cerebral territories.
platelet link
blood coagulation link ↑ INCREASED platelet activation link ↑ INCREASED
Show evidence (1 reference)
DOI:10.3390/ijms25084351 SUPPORT Human Clinical
"The current evidence demonstrates that plaque vulnerability phenotypes are multiple and heterogeneous and are associated with many highly complex molecular pathways that determine the activation of an immune-mediated cascade that culminates in thromboinflammation."
This supports thromboinflammatory plaque biology as the bridge from vulnerable plaque to embolic ischemic events.
Hemodynamic cerebral perfusion impairment
Some high-grade carotid stenoses cause ipsilateral perfusion delay or flow failure, which can contribute to cognitive impairment and may be targeted in hemodynamic substudies of revascularization trials.
response to hypoxia link ↑ INCREASED
Show evidence (1 reference)
clinicaltrials:NCT03121209 SUPPORT Human Clinical
"We aim to determine whether cognitive impairment attributable to cerebral hemodynamic impairment in patients with high-grade asymptomatic carotid artery stenosis is reversible with restoration of flow."
This trial summary directly links high-grade asymptomatic carotid stenosis, cerebral hemodynamic impairment, cognitive impairment, restoration of flow, and the hypoxia response expected from impaired cerebral perfusion.
✶

Histopathology

1
Vulnerable carotid atherosclerotic plaque
Vulnerable carotid plaque morphology includes lipid-rich necrotic core, intraplaque hemorrhage, thin fibrous cap, surface ulceration, neovascularization, microcalcification, large plaque dimensions, and plaque rupture.
Show evidence (1 reference)
DOI:10.3390/ijms25084351 SUPPORT Human Clinical
"In macroscopic evaluation, vulnerable plaques are characterized by one or more of the following features: microcalcification; neovascularization; lipid-rich necrotic cores (LRNCs); intraplaque hemorrhage (IPH); thin fibrous caps; plaque surface ulceration; huge dimensions, suggesting stenosis;..."
This abstract directly supports the histopathologic and macroscopic plaque features included in vulnerable carotid plaque morphology.
⬡

Pathograph

Use the checkboxes to hide or show graph categories. Hover nodes for evidence and cross-linked metadata.
Pathograph: causal mechanism network for Carotid Stenosis Interactive directed graph showing how pathophysiology mechanisms, phenotypes, genetic factors and variants, experimental models, environmental triggers, and treatments relate through causal and linked edges.
●

Phenotypes

5
Cardiovascular 1
Ischemic stroke Ischemic stroke (HP:0002140)
Show evidence (1 reference)
PMID:38896635 SUPPORT Human Clinical
"Internal carotid artery (ICA) stenosis causes about 15% of ischemic strokes."
This diagnostic cohort abstract directly supports ischemic stroke as a major clinical consequence of ICA stenosis.
Nervous System 1
Cognitive impairment from hemodynamic compromise Cognitive impairment (HP:0100543)
Show evidence (1 reference)
clinicaltrials:NCT03121209 PARTIAL Human Clinical
"CREST-H addresses the intriguing question of whether cognitive impairment can be reversed when it arises from abnormal cerebral hemodynamic perfusion in a hemodynamically impaired subset of the CREST-2 -randomized patients."
The trial summary supports cognitive impairment as an investigated hemodynamic consequence in a subset of high-grade asymptomatic carotid stenosis patients.
Other 3
Carotid artery stenosis Carotid artery stenosis (HP:0100546)
Show evidence (1 reference)
PMID:37303351 SUPPORT Human Clinical
"Carotid stenosis (CS) is a buildup of atherosclerotic plaque within the artery leading to a wide range of symptoms, from mild symptoms, including blurred vision and confusion, to much more life-threatening presentations, including paralysis due to stroke."
This supports carotid stenosis as an atherosclerotic arterial lesion and links it to the symptom spectrum.
Transient ischemic attack Transient ischemic attack (HP:0002326)
Show evidence (1 reference)
PMID:1852179 SUPPORT Human Clinical
"hemispheric or retinal transient ischemic attack or a nondisabling stroke within the 120 days before entry and had stenosis of 70 to 99 percent in the symptomatic carotid artery."
The NASCET abstract directly documents hemispheric and retinal TIA presentations in symptomatic high-grade carotid stenosis.
Amaurosis fugax Amaurosis fugax (HP:0100576)
Show evidence (1 reference)
PMID:1852179 PARTIAL Human Clinical
"hemispheric or retinal transient ischemic attack or a nondisabling stroke within the 120 days before entry and had stenosis of 70 to 99 percent in the symptomatic carotid artery."
Retinal TIA is the carotid-territory event underlying amaurosis fugax, although the abstract does not use the term amaurosis fugax.
💊

Treatments

3
Optimal medical therapy and risk-factor modification
Action: Pharmacotherapy NCIT:C15986
Intensive medical management includes antithrombotic and lipid-lowering strategies, treatment of hypertension, diabetes and other vascular risk factors, smoking cessation, diet and exercise changes, and shared decision-making about revascularization.
Target Phenotypes: Ischemic stroke ↗
Show evidence (2 references)
DOI:10.1093/cvr/cvad135 SUPPORT Human Clinical
"Such strokes could be largely prevented through optimal medical therapy and carotid revascularization."
This consensus abstract supports optimal medical therapy as a core stroke-prevention strategy in carotid atherosclerotic disease.
PMID:37303351 SUPPORT Human Clinical
"Both surgical and medical regimens are beneficial in treating patients, but it is still an ongoing debate as to which is predominantly superior."
This supports medical therapy as beneficial while preserving uncertainty about treatment selection.
Carotid endarterectomy
Action: Carotid Endarterectomy NCIT:C157807
Carotid endarterectomy surgically removes plaque from the carotid artery and is a major evidence-backed revascularization option for selected symptomatic high-grade stenosis and selected asymptomatic stenosis patients at acceptable perioperative risk.
Target Phenotypes: Ischemic stroke ↗ Transient ischemic attack ↗
Show evidence (2 references)
PMID:1852179 SUPPORT Human Clinical
"Carotid endarterectomy is highly beneficial to patients with recent hemispheric and retinal transient ischemic attacks or nondisabling strokes and ipsilateral high-grade stenosis (70 to 99 percent) of the internal carotid artery."
This randomized trial abstract directly supports carotid endarterectomy for symptomatic high-grade carotid stenosis.
PMID:7723155 SUPPORT Human Clinical
"Patients with asymptomatic carotid artery stenosis of 60% or greater reduction in diameter and whose general health makes them good candidates for elective surgery will have a reduced 5-year risk of ipsilateral stroke if carotid endarterectomy performed with less than 3% perioperative morbidity..."
This supports selected use of carotid endarterectomy in asymptomatic stenosis under low perioperative risk conditions.
Carotid artery stenting
Action: angioplasty Ontology label: Angioplasty NCIT:C51999
Carotid artery stenting is an endovascular revascularization option for selected internal carotid stenosis patients, with patient selection, embolic-protection strategy, age, and periprocedural stroke versus myocardial-infarction tradeoffs influencing choice relative to endarterectomy.
Target Phenotypes: Ischemic stroke ↗
Show evidence (2 references)
PMID:38683353 SUPPORT Human Clinical
"Carotid artery stenting has an established role in the management of internal carotid artery stenosis; this Standards of Practice document provides up-to-date recommendations for its safe performance."
This standards abstract supports carotid artery stenting as an established management option for selected internal carotid artery stenosis.
PMID:20505173 SUPPORT Human Clinical
"Carotid-artery stenting and carotid endarterectomy are both options for treating carotid-artery stenosis, an important cause of stroke."
The CREST abstract supports stenting and endarterectomy as comparative carotid stenosis treatment options.
🌍

Environmental Factors

2
Cardiometabolic comorbidities
Hypertension, diabetes, and chronic kidney disease contribute to carotid plaque development and overlap with broader atherosclerotic cardiovascular risk.
Show evidence (1 reference)
PMID:37303351 SUPPORT Human Clinical
"comorbid hypertension, diabetes, and chronic kidney disease (CKD), and lifestyle aspects, including smoking and diet, played the most salient role in plaque development."
This review abstract identifies these comorbidities as salient contributors to plaque development.
Smoking and diet
Smoking and diet are modifiable lifestyle risk factors that contribute to carotid plaque development and are targets of medical prevention.
Show evidence (1 reference)
PMID:37303351 SUPPORT Human Clinical
"lifestyle aspects, including smoking and diet, played the most salient role in plaque development."
This directly supports smoking and diet as lifestyle contributors to plaque development.
🔬

Clinical Trials

3
NCT00004732 NOT_APPLICABLE COMPLETED
CREST compared stent-assisted carotid angioplasty with carotid endarterectomy for symptomatic and asymptomatic carotid artery stenosis.
Target Phenotypes: Ischemic stroke ↗
Show evidence (1 reference)
clinicaltrials:NCT00004732 SUPPORT Human Clinical
"The purpose of the Carotid Revascularization Endarterectomy versus Stenting Trial (CREST) is to compare the relatively new procedure of stent-assisted carotid angioplasty (CAS) to the traditional and accepted surgical approach of carotid endarterectomy (CEA) for the treatment of carotid artery..."
The trial summary directly supports CREST as a comparative stenting-versus-endarterectomy trial for symptomatic and asymptomatic carotid stenosis.
NCT02089217 NOT_APPLICABLE COMPLETED
CREST-2 compared carotid endarterectomy plus intensive medical management and carotid stenting plus intensive medical management against intensive medical management alone in asymptomatic high-grade carotid stenosis.
Target Phenotypes: Ischemic stroke ↗
Show evidence (1 reference)
clinicaltrials:NCT02089217 SUPPORT Human Clinical
"Carotid revascularization for primary prevention of stroke (CREST-2) is two independent multicenter, randomized controlled trials of carotid revascularization and intensive medical management versus medical management alone in patients with asymptomatic high-grade carotid stenosis."
The trial summary directly supports CREST-2 as a randomized comparison of revascularization plus intensive medical management versus medical management alone.
NCT03121209 PHASE_III ACTIVE_NOT_RECRUITING
CREST-H is a CREST-2 ancillary study testing whether hemodynamic impairment and cognitive impairment in high-grade asymptomatic carotid stenosis improve after restoration of flow.
Target Phenotypes: Cognitive impairment ↗
Show evidence (1 reference)
clinicaltrials:NCT03121209 SUPPORT Human Clinical
"CREST-H addresses the intriguing question of whether cognitive impairment can be reversed when it arises from abnormal cerebral hemodynamic perfusion in a hemodynamically impaired subset of the CREST-2 -randomized patients."
The trial summary supports CREST-H as a hemodynamic cognitive-outcomes study nested in CREST-2.
{ }

Source YAML

click to show 
name: Carotid Stenosis
creation_date: "2026-05-06T18:58:50Z"
updated_date: "2026-05-06T19:46:27Z"
description: >-
  Carotid stenosis is narrowing of the extracranial carotid arterial lumen,
  most often involving the carotid bifurcation or internal carotid artery and
  most commonly caused by atherosclerotic plaque. Disease severity is not only a
  function of percent narrowing: vulnerable plaque features, superimposed
  thrombosis, embolization, and reduced cerebral or retinal perfusion determine
  the risk of transient ischemic attack, amaurosis fugax, ischemic stroke, and
  hemodynamic cognitive effects.
category: Complex
disease_term:
  preferred_term: carotid stenosis
  term:
    id: MONDO:0001612
    label: carotid stenosis
parents:
- Carotid artery disorder
- Vascular disorder
- Cerebrovascular Disease
synonyms:
- Carotid artery stenosis
- Internal carotid artery stenosis
- Extracranial carotid stenosis
- Carotid atherosclerotic stenosis
- Asymptomatic carotid artery stenosis
- Symptomatic carotid stenosis
references:
- reference: DOI:10.1007/s00270-024-03707-y
  title: CIRSE Standards of Practice on Carotid Artery Stenting
  found_in:
  - Carotid_Stenosis-deep-research-falcon.md
  findings: []
- reference: DOI:10.1016/j.ejvs.2022.04.011
  title: "Editor's Choice - European Society for Vascular Surgery (ESVS) 2023 Clinical Practice Guidelines on the Management of Atherosclerotic Carotid and Vertebral Artery Disease"
  found_in:
  - Carotid_Stenosis-deep-research-falcon.md
  findings: []
- reference: DOI:10.1055/a-2175-4029
  title: Elective carotid stenting fulfills quality standards defined in guidelines
  found_in:
  - Carotid_Stenosis-deep-research-falcon.md
  findings: []
- reference: DOI:10.1093/cvr/cvad135
  title: "Stroke risk management in carotid atherosclerotic disease: a clinical consensus statement of the ESC Council on Stroke and the ESC Working Group on Aorta and Peripheral Vascular Diseases"
  found_in:
  - Carotid_Stenosis-deep-research-falcon.md
  findings: []
- reference: DOI:10.1101/2023.09.25.23296124
  title: "Diagnostic accuracy of carotid plaque instability by noninvasive imaging: a systematic review and meta-analysis"
  found_in:
  - Carotid_Stenosis-deep-research-falcon.md
  findings: []
- reference: DOI:10.1136/jnis-2022-018732
  title: "Asymptomatic carotid artery stenosis: a summary of current state of evidence for revascularization and emerging high-risk features"
  found_in:
  - Carotid_Stenosis-deep-research-falcon.md
  findings: []
- reference: DOI:10.1161/str.0000000000000475
  title: "2024 Guideline for the Primary Prevention of Stroke: A Guideline From the American Heart Association/American Stroke Association"
  found_in:
  - Carotid_Stenosis-deep-research-falcon.md
  findings: []
- reference: DOI:10.1161/strokeaha.123.046894
  title: Prediction of Severe Baseline Asymptomatic Carotid Stenosis and Subsequent Risk of Stroke and Cardiovascular Disease
  found_in:
  - Carotid_Stenosis-deep-research-falcon.md
  findings: []
- reference: DOI:10.1590/1677-5449.202300942
  title: Brazilian Angiology and Vascular Surgery Society Guidelines for the Treatment of Extracranial Cerebrovascular Disease
  found_in:
  - Carotid_Stenosis-deep-research-falcon.md
  findings: []
- reference: DOI:10.3390/ijms25084351
  title: "Molecular Pathways of Vulnerable Carotid Plaques at Risk of Ischemic Stroke: A Narrative Review"
  found_in:
  - Carotid_Stenosis-deep-research-falcon.md
  findings: []
- reference: DOI:10.54522/jvsgbi.2024.156
  title: Current practice in ultrasound grading of carotid artery stenosis in the UK and Ireland
  found_in:
  - Carotid_Stenosis-deep-research-falcon.md
  findings: []
prevalence:
- population: Adults aged 45-80 years in the REACH-derived validation cohort without prior carotid procedures
  percentage: 6.3% severe baseline asymptomatic carotid artery stenosis
  notes: >-
    This estimate applies to a high vascular-risk registry population, not to
    unselected population screening.
  evidence:
  - reference: PMID:39319460
    reference_title: Prediction of Severe Baseline Asymptomatic Carotid Stenosis and Subsequent Risk of Stroke and Cardiovascular Disease.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: 1662 (6.3%) had severe baseline ACAS.
    explanation: This registry-derived cohort directly reports severe asymptomatic carotid stenosis prevalence in the studied population.
pathophysiology:
- name: Atherosclerotic carotid plaque formation
  description: >-
    Endothelial dysfunction, lipid retention, foam-cell accumulation, vascular
    smooth-muscle remodeling, and inflammatory extracellular-matrix remodeling
    form atherosclerotic plaque in the carotid arterial wall and progressively
    narrow the lumen.
  cell_types:
  - preferred_term: endothelial cell
    term:
      id: CL:0000115
      label: endothelial cell
  - preferred_term: vascular smooth muscle cell
    term:
      id: CL:0000359
      label: vascular associated smooth muscle cell
  - preferred_term: foam cell
    term:
      id: CL:0000891
      label: foam cell
  - preferred_term: macrophage
    term:
      id: CL:0000235
      label: macrophage
  biological_processes:
  - preferred_term: inflammatory response
    term:
      id: GO:0006954
      label: inflammatory response
    modifier: INCREASED
  - preferred_term: extracellular matrix organization
    term:
      id: GO:0030198
      label: extracellular matrix organization
    modifier: ABNORMAL
  evidence:
  - reference: PMID:37303351
    reference_title: "Carotid Artery Stenosis: A Look Into the Diagnostic and Management Strategies, and Related Complications."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      CS is seen undergoing almost the same pathogenesis of any atherosclerotic plaque formation, from endothelial damage of the artery lumen to the formation of a fibrous cap with a foam cell, lipid-filled core.
    explanation: This abstract directly supports endothelial damage, fibrous cap formation, foam cells, and lipid core formation in carotid stenosis.
  downstream:
  - target: Flow-limiting carotid lumen narrowing
    description: Plaque growth encroaches on the lumen and creates measurable carotid stenosis.
    causal_link_type: DIRECT
- name: Flow-limiting carotid lumen narrowing
  description: >-
    Plaque burden at the carotid bifurcation or internal carotid artery narrows
    the arterial lumen and creates a graded stenotic lesion assessed by vascular
    imaging.
  locations:
  - preferred_term: internal carotid artery
    term:
      id: UBERON:0001532
      label: internal carotid artery
  biological_processes:
  - preferred_term: blood vessel remodeling
    term:
      id: GO:0001974
      label: blood vessel remodeling
    modifier: ABNORMAL
  evidence:
  - reference: DOI:10.1136/jnis-2022-018732
    reference_title: "Asymptomatic carotid artery stenosis: a summary of current state of evidence for revascularization and emerging high-risk features"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Carotid artery stenosis is a leading cause of ischemic stroke.
    explanation: This review supports carotid artery stenosis as the disease-defining vascular lesion and clinically important stroke-risk condition.
  downstream:
  - target: Vulnerable plaque instability
    description: Stenotic plaques can acquire high-risk structural and molecular features that increase embolic risk.
    causal_link_type: DIRECT
  - target: Hemodynamic cerebral perfusion impairment
    description: High-grade stenosis can reduce ipsilateral cerebral perfusion reserve in a subset of patients.
    causal_link_type: DIRECT
- name: Vulnerable plaque instability
  description: >-
    Vulnerable carotid plaques contain lipid-rich necrotic cores, thin fibrous
    caps, intraplaque hemorrhage, ulceration, neovascularization, inflammatory
    mediators, oxidized LDL, and proteolytic enzymes that weaken the fibrous cap
    and increase rupture or embolization risk, including in some non-severe
    stenoses.
  cell_types:
  - preferred_term: macrophage
    term:
      id: CL:0000235
      label: macrophage
  - preferred_term: endothelial cell
    term:
      id: CL:0000115
      label: endothelial cell
  - preferred_term: vascular smooth muscle cell
    term:
      id: CL:0000359
      label: vascular associated smooth muscle cell
  biological_processes:
  - preferred_term: leukocyte migration
    term:
      id: GO:0050900
      label: leukocyte migration
    modifier: INCREASED
  - preferred_term: extracellular matrix disassembly
    term:
      id: GO:0022617
      label: extracellular matrix disassembly
    modifier: INCREASED
  - preferred_term: response to oxidative stress
    term:
      id: GO:0006979
      label: response to oxidative stress
    modifier: INCREASED
  evidence:
  - reference: DOI:10.3390/ijms25084351
    reference_title: "Molecular Pathways of Vulnerable Carotid Plaques at Risk of Ischemic Stroke: A Narrative Review"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      In macroscopic evaluation, vulnerable plaques are characterized by one or more of the following features: microcalcification; neovascularization; lipid-rich necrotic cores (LRNCs); intraplaque hemorrhage (IPH); thin fibrous caps; plaque surface ulceration; huge dimensions, suggesting stenosis; and plaque rupture.
    explanation: This directly supports vulnerable plaque structural features relevant to carotid stenosis risk stratification.
  - reference: DOI:10.3390/ijms25084351
    reference_title: "Molecular Pathways of Vulnerable Carotid Plaques at Risk of Ischemic Stroke: A Narrative Review"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Inflammatory biomarkers, such as cytokines and adhesion molecules, lipid-related markers like oxidized low-density lipoprotein (LDL), and proteolytic enzymes capable of degrading extracellular matrix components are among the key molecules that are scrutinized for their associative roles in plaque instability.
    explanation: This supports inflammatory, oxidized-lipid, and extracellular-matrix degradation mechanisms in vulnerable plaques.
  downstream:
  - target: Thromboembolic cerebral and retinal ischemia
    description: Plaque rupture, ulceration, and thrombogenicity can generate emboli or local thrombosis.
    causal_link_type: DIRECT
- name: Thromboembolic cerebral and retinal ischemia
  description: >-
    Unstable plaque, superimposed thrombosis, platelet activation, and reduced
    perfusion reserve can cause transient or permanent ischemia in ipsilateral
    retinal and cerebral territories.
  cell_types:
  - preferred_term: platelet
    term:
      id: CL:0000233
      label: platelet
  biological_processes:
  - preferred_term: blood coagulation
    term:
      id: GO:0007596
      label: blood coagulation
    modifier: INCREASED
  - preferred_term: platelet activation
    term:
      id: GO:0030168
      label: platelet activation
    modifier: INCREASED
  evidence:
  - reference: DOI:10.3390/ijms25084351
    reference_title: "Molecular Pathways of Vulnerable Carotid Plaques at Risk of Ischemic Stroke: A Narrative Review"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      The current evidence demonstrates that plaque vulnerability phenotypes are multiple and heterogeneous and are associated with many highly complex molecular pathways that determine the activation of an immune-mediated cascade that culminates in thromboinflammation.
    explanation: This supports thromboinflammatory plaque biology as the bridge from vulnerable plaque to embolic ischemic events.
- name: Hemodynamic cerebral perfusion impairment
  description: >-
    Some high-grade carotid stenoses cause ipsilateral perfusion delay or flow
    failure, which can contribute to cognitive impairment and may be targeted in
    hemodynamic substudies of revascularization trials.
  biological_processes:
  - preferred_term: response to hypoxia
    term:
      id: GO:0001666
      label: response to hypoxia
    modifier: INCREASED
  evidence:
  - reference: clinicaltrials:NCT03121209
    reference_title: Carotid Revascularization and Medical Management for Asymptomatic Carotid Stenosis Trial - Hemodynamics
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      We aim to determine whether cognitive impairment attributable to cerebral hemodynamic impairment in patients with high-grade asymptomatic carotid artery stenosis is reversible with restoration of flow.
    explanation: This trial summary directly links high-grade asymptomatic carotid stenosis, cerebral hemodynamic impairment, cognitive impairment, restoration of flow, and the hypoxia response expected from impaired cerebral perfusion.
histopathology:
- name: Vulnerable carotid atherosclerotic plaque
  description: >-
    Vulnerable carotid plaque morphology includes lipid-rich necrotic core,
    intraplaque hemorrhage, thin fibrous cap, surface ulceration,
    neovascularization, microcalcification, large plaque dimensions, and plaque
    rupture.
  evidence:
  - reference: DOI:10.3390/ijms25084351
    reference_title: "Molecular Pathways of Vulnerable Carotid Plaques at Risk of Ischemic Stroke: A Narrative Review"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      In macroscopic evaluation, vulnerable plaques are characterized by one or more of the following features: microcalcification; neovascularization; lipid-rich necrotic cores (LRNCs); intraplaque hemorrhage (IPH); thin fibrous caps; plaque surface ulceration; huge dimensions, suggesting stenosis; and plaque rupture.
    explanation: This abstract directly supports the histopathologic and macroscopic plaque features included in vulnerable carotid plaque morphology.
phenotypes:
- category: Cardiovascular
  name: Carotid artery stenosis
  diagnostic: true
  description: >-
    Narrowing of the carotid artery is the defining vascular lesion and is
    usually assessed by duplex ultrasonography, CT angiography, MR angiography,
    or catheter angiography.
  phenotype_term:
    preferred_term: Carotid artery stenosis
    term:
      id: HP:0100546
      label: Carotid artery stenosis
  evidence:
  - reference: PMID:37303351
    reference_title: "Carotid Artery Stenosis: A Look Into the Diagnostic and Management Strategies, and Related Complications."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Carotid stenosis (CS) is a buildup of atherosclerotic plaque within the artery leading to a wide range of symptoms, from mild symptoms, including blurred vision and confusion, to much more life-threatening presentations, including paralysis due to stroke.
    explanation: This supports carotid stenosis as an atherosclerotic arterial lesion and links it to the symptom spectrum.
- category: Neurological
  name: Ischemic stroke
  description: >-
    Symptomatic carotid stenosis may cause ipsilateral ischemic stroke through
    artery-to-artery embolism, local thrombosis, or impaired cerebral perfusion.
  phenotype_term:
    preferred_term: Ischemic stroke
    term:
      id: HP:0002140
      label: Ischemic stroke
  evidence:
  - reference: PMID:38896635
    reference_title: Accuracy of duplex ultrasonography versus angiotomography for the diagnosis of extracranial internal carotid stenosis.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Internal carotid artery (ICA) stenosis causes about 15% of ischemic strokes.
    explanation: This diagnostic cohort abstract directly supports ischemic stroke as a major clinical consequence of ICA stenosis.
- category: Neurological
  name: Transient ischemic attack
  description: >-
    Transient focal neurologic symptoms can occur when carotid plaque emboli or
    flow limitation cause short-lived cerebral or retinal ischemia.
  phenotype_term:
    preferred_term: Transient ischemic attack
    term:
      id: HP:0002326
      label: Transient ischemic attack
  evidence:
  - reference: PMID:1852179
    reference_title: Beneficial effect of carotid endarterectomy in symptomatic patients with high-grade carotid stenosis.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      hemispheric or retinal transient ischemic attack or a nondisabling stroke within the 120 days before entry and had stenosis of 70 to 99 percent in the symptomatic carotid artery.
    explanation: The NASCET abstract directly documents hemispheric and retinal TIA presentations in symptomatic high-grade carotid stenosis.
- category: Ophthalmological
  name: Amaurosis fugax
  description: >-
    Transient monocular visual loss can occur when embolic or hemodynamic
    compromise affects the ipsilateral retinal circulation.
  phenotype_term:
    preferred_term: Amaurosis fugax
    term:
      id: HP:0100576
      label: Amaurosis fugax
  evidence:
  - reference: PMID:1852179
    reference_title: Beneficial effect of carotid endarterectomy in symptomatic patients with high-grade carotid stenosis.
    supports: PARTIAL
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      hemispheric or retinal transient ischemic attack or a nondisabling stroke within the 120 days before entry and had stenosis of 70 to 99 percent in the symptomatic carotid artery.
    explanation: Retinal TIA is the carotid-territory event underlying amaurosis fugax, although the abstract does not use the term amaurosis fugax.
- category: Neurological
  name: Cognitive impairment from hemodynamic compromise
  description: >-
    A subset of high-grade asymptomatic carotid stenosis patients may have
    cognitive impairment attributable to ipsilateral cerebral hemodynamic
    impairment.
  phenotype_term:
    preferred_term: Cognitive impairment
    term:
      id: HP:0100543
      label: Cognitive impairment
  evidence:
  - reference: clinicaltrials:NCT03121209
    reference_title: Carotid Revascularization and Medical Management for Asymptomatic Carotid Stenosis Trial - Hemodynamics
    supports: PARTIAL
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      CREST-H addresses the intriguing question of whether cognitive impairment can be reversed when it arises from abnormal cerebral hemodynamic perfusion in a hemodynamically impaired subset of the CREST-2 -randomized patients.
    explanation: The trial summary supports cognitive impairment as an investigated hemodynamic consequence in a subset of high-grade asymptomatic carotid stenosis patients.
progression:
- phase: Asymptomatic high-grade stenosis
  age_range: Adult to older adult
  notes: >-
    High-grade asymptomatic stenosis may be found through targeted vascular
    assessment in high-risk patients and carries future stroke and cardiovascular
    event risk.
  evidence:
  - reference: PMID:39319460
    reference_title: Prediction of Severe Baseline Asymptomatic Carotid Stenosis and Subsequent Risk of Stroke and Cardiovascular Disease.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Significantly higher incidence rates of stroke (Ptrend<0.011) and CVD (Ptrend<0.0001) during follow-up were found with increasing PACAS risk groups.
    explanation: This supports future stroke and cardiovascular event risk in higher predicted-risk asymptomatic carotid stenosis groups.
- phase: Symptomatic carotid-territory ischemia
  age_range: Adult to older adult
  notes: >-
    Symptomatic disease includes recent hemispheric or retinal TIA and
    nondisabling stroke in the territory of the stenotic carotid artery.
  evidence:
  - reference: PMID:1852179
    reference_title: Beneficial effect of carotid endarterectomy in symptomatic patients with high-grade carotid stenosis.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      recent hemispheric and retinal transient ischemic attacks or nondisabling strokes and ipsilateral high-grade stenosis (70 to 99 percent) of the internal carotid artery.
    explanation: This directly defines symptomatic high-grade carotid stenosis in the NASCET population.
environmental:
- name: Cardiometabolic comorbidities
  presence: Positive
  description: >-
    Hypertension, diabetes, and chronic kidney disease contribute to carotid
    plaque development and overlap with broader atherosclerotic cardiovascular
    risk.
  evidence:
  - reference: PMID:37303351
    reference_title: "Carotid Artery Stenosis: A Look Into the Diagnostic and Management Strategies, and Related Complications."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      comorbid hypertension, diabetes, and chronic kidney disease (CKD), and lifestyle aspects, including smoking and diet, played the most salient role in plaque development.
    explanation: This review abstract identifies these comorbidities as salient contributors to plaque development.
- name: Smoking and diet
  presence: Positive
  description: >-
    Smoking and diet are modifiable lifestyle risk factors that contribute to
    carotid plaque development and are targets of medical prevention.
  evidence:
  - reference: PMID:37303351
    reference_title: "Carotid Artery Stenosis: A Look Into the Diagnostic and Management Strategies, and Related Complications."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      lifestyle aspects, including smoking and diet, played the most salient role in plaque development.
    explanation: This directly supports smoking and diet as lifestyle contributors to plaque development.
diagnosis:
- name: Duplex ultrasound with confirmatory CT angiography
  description: >-
    Duplex ultrasonography is commonly used as first-line assessment of ICA
    stenosis. Significant stenosis is often confirmed or further characterized
    with CT angiography or another cross-sectional vascular imaging modality.
  diagnosis_term:
    preferred_term: Diagnostic Imaging Testing
    term:
      id: NCIT:C16502
      label: Diagnostic Imaging Testing
  results: Estimates stenosis severity and informs medical versus revascularization management.
  evidence:
  - reference: PMID:38896635
    reference_title: Accuracy of duplex ultrasonography versus angiotomography for the diagnosis of extracranial internal carotid stenosis.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Duplex ultrasonography (DUS) is the first line of investigation of ICA stenosis, but its accuracy varies in the literature and it is usual to complement the study with another more accurate exam when faced with significant stenosis.
    explanation: This directly supports DUS as first-line imaging and confirmatory imaging for significant stenosis.
- name: CT angiography for severe ICA stenosis
  description: >-
    CT angiography can accurately diagnose severe internal carotid stenosis and
    is used to characterize anatomy for procedural planning.
  diagnosis_term:
    preferred_term: computed tomography angiography
    term:
      id: NCIT:C202408
      label: Computed Tomography Angiography
  results: High sensitivity and specificity for severe ICA stenosis in meta-analysis.
  evidence:
  - reference: PMID:39143526
    reference_title: Systematic review and meta-analysis of the diagnostic value of computed tomography angiography for severe internal carotid artery stenosis.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      CTA demonstrated high sensitivity and specificity for diagnosing severe ICA stenosis.
    explanation: This meta-analysis conclusion directly supports CTA for severe ICA stenosis diagnosis.
- name: Vulnerable plaque risk stratification
  description: >-
    Imaging and biomarker assessment increasingly distinguish plaque
    vulnerability from stenosis percentage alone, including high-risk features
    such as intraplaque hemorrhage, ulceration, lipid-rich necrotic core, and
    thin fibrous cap.
  diagnosis_term:
    preferred_term: vascular imaging
  results: Identifies high-risk plaque composition and may refine stroke-risk stratification.
  evidence:
  - reference: DOI:10.3390/ijms25084351
    reference_title: "Molecular Pathways of Vulnerable Carotid Plaques at Risk of Ischemic Stroke: A Narrative Review"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Recognizing these macroscopic characteristics is crucial for estimating the risk of cerebrovascular events, also in the case of non-significant (less than 50%) stenosis.
    explanation: This supports using plaque characteristics, not stenosis percentage alone, for cerebrovascular risk stratification.
treatments:
- name: Optimal medical therapy and risk-factor modification
  description: >-
    Intensive medical management includes antithrombotic and lipid-lowering
    strategies, treatment of hypertension, diabetes and other vascular risk
    factors, smoking cessation, diet and exercise changes, and shared
    decision-making about revascularization.
  treatment_term:
    preferred_term: Pharmacotherapy
    term:
      id: NCIT:C15986
      label: Pharmacotherapy
  target_phenotypes:
  - preferred_term: Ischemic stroke
    term:
      id: HP:0002140
      label: Ischemic stroke
  evidence:
  - reference: DOI:10.1093/cvr/cvad135
    reference_title: "Stroke risk management in carotid atherosclerotic disease: a clinical consensus statement of the ESC Council on Stroke and the ESC Working Group on Aorta and Peripheral Vascular Diseases"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Such strokes could be largely prevented through optimal medical therapy and carotid revascularization.
    explanation: This consensus abstract supports optimal medical therapy as a core stroke-prevention strategy in carotid atherosclerotic disease.
  - reference: PMID:37303351
    reference_title: "Carotid Artery Stenosis: A Look Into the Diagnostic and Management Strategies, and Related Complications."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Both surgical and medical regimens are beneficial in treating patients, but it is still an ongoing debate as to which is predominantly superior.
    explanation: This supports medical therapy as beneficial while preserving uncertainty about treatment selection.
- name: Carotid endarterectomy
  description: >-
    Carotid endarterectomy surgically removes plaque from the carotid artery and
    is a major evidence-backed revascularization option for selected symptomatic
    high-grade stenosis and selected asymptomatic stenosis patients at acceptable
    perioperative risk.
  treatment_term:
    preferred_term: Carotid Endarterectomy
    term:
      id: NCIT:C157807
      label: Carotid Endarterectomy
  target_phenotypes:
  - preferred_term: Ischemic stroke
    term:
      id: HP:0002140
      label: Ischemic stroke
  - preferred_term: Transient ischemic attack
    term:
      id: HP:0002326
      label: Transient ischemic attack
  evidence:
  - reference: PMID:1852179
    reference_title: Beneficial effect of carotid endarterectomy in symptomatic patients with high-grade carotid stenosis.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Carotid endarterectomy is highly beneficial to patients with recent hemispheric and retinal transient ischemic attacks or nondisabling strokes and ipsilateral high-grade stenosis (70 to 99 percent) of the internal carotid artery.
    explanation: This randomized trial abstract directly supports carotid endarterectomy for symptomatic high-grade carotid stenosis.
  - reference: PMID:7723155
    reference_title: Endarterectomy for asymptomatic carotid artery stenosis.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Patients with asymptomatic carotid artery stenosis of 60% or greater reduction in diameter and whose general health makes them good candidates for elective surgery will have a reduced 5-year risk of ipsilateral stroke if carotid endarterectomy performed with less than 3% perioperative morbidity and mortality is added to aggressive management of modifiable risk factors.
    explanation: This supports selected use of carotid endarterectomy in asymptomatic stenosis under low perioperative risk conditions.
- name: Carotid artery stenting
  description: >-
    Carotid artery stenting is an endovascular revascularization option for
    selected internal carotid stenosis patients, with patient selection,
    embolic-protection strategy, age, and periprocedural stroke versus
    myocardial-infarction tradeoffs influencing choice relative to
    endarterectomy.
  treatment_term:
    preferred_term: angioplasty
    term:
      id: NCIT:C51999
      label: Angioplasty
  target_phenotypes:
  - preferred_term: Ischemic stroke
    term:
      id: HP:0002140
      label: Ischemic stroke
  evidence:
  - reference: PMID:38683353
    reference_title: CIRSE Standards of Practice on Carotid Artery Stenting.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Carotid artery stenting has an established role in the management of internal carotid artery stenosis; this Standards of Practice document provides up-to-date recommendations for its safe performance.
    explanation: This standards abstract supports carotid artery stenting as an established management option for selected internal carotid artery stenosis.
  - reference: PMID:20505173
    reference_title: Stenting versus endarterectomy for treatment of carotid-artery stenosis.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Carotid-artery stenting and carotid endarterectomy are both options for treating carotid-artery stenosis, an important cause of stroke.
    explanation: The CREST abstract supports stenting and endarterectomy as comparative carotid stenosis treatment options.
clinical_trials:
- name: NCT00004732
  phase: NOT_APPLICABLE
  status: COMPLETED
  description: >-
    CREST compared stent-assisted carotid angioplasty with carotid
    endarterectomy for symptomatic and asymptomatic carotid artery stenosis.
  target_phenotypes:
  - preferred_term: Ischemic stroke
    term:
      id: HP:0002140
      label: Ischemic stroke
  evidence:
  - reference: clinicaltrials:NCT00004732
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      The purpose of the Carotid Revascularization Endarterectomy versus Stenting Trial (CREST) is to compare the relatively new procedure of stent-assisted carotid angioplasty (CAS) to the traditional and accepted surgical approach of carotid endarterectomy (CEA) for the treatment of carotid artery stenosis to prevent recurrent strokes in those patients who have had a TIA (transient ischemic attack) or a mild stroke within the past 6 months (symptomatic) and in those patients who have not had any symptoms within the past 6 months (asymptomatic).
    explanation: The trial summary directly supports CREST as a comparative stenting-versus-endarterectomy trial for symptomatic and asymptomatic carotid stenosis.
- name: NCT02089217
  phase: NOT_APPLICABLE
  status: COMPLETED
  description: >-
    CREST-2 compared carotid endarterectomy plus intensive medical management
    and carotid stenting plus intensive medical management against intensive
    medical management alone in asymptomatic high-grade carotid stenosis.
  target_phenotypes:
  - preferred_term: Ischemic stroke
    term:
      id: HP:0002140
      label: Ischemic stroke
  evidence:
  - reference: clinicaltrials:NCT02089217
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Carotid revascularization for primary prevention of stroke (CREST-2) is two independent multicenter, randomized controlled trials of carotid revascularization and intensive medical management versus medical management alone in patients with asymptomatic high-grade carotid stenosis.
    explanation: The trial summary directly supports CREST-2 as a randomized comparison of revascularization plus intensive medical management versus medical management alone.
- name: NCT03121209
  phase: PHASE_III
  status: ACTIVE_NOT_RECRUITING
  description: >-
    CREST-H is a CREST-2 ancillary study testing whether hemodynamic impairment
    and cognitive impairment in high-grade asymptomatic carotid stenosis improve
    after restoration of flow.
  target_phenotypes:
  - preferred_term: Cognitive impairment
    term:
      id: HP:0100543
      label: Cognitive impairment
  evidence:
  - reference: clinicaltrials:NCT03121209
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      CREST-H addresses the intriguing question of whether cognitive impairment can be reversed when it arises from abnormal cerebral hemodynamic perfusion in a hemodynamically impaired subset of the CREST-2 -randomized patients.
    explanation: The trial summary supports CREST-H as a hemodynamic cognitive-outcomes study nested in CREST-2.
review_notes: >-
  Falcon deep research emphasized vulnerable plaque biology, asymptomatic versus
  symptomatic carotid stenosis framing, DUS/CTA diagnostics, medical therapy and
  revascularization, and CREST/CREST-2 trial context. Several report-suggested
  ontology IDs were corrected after local OAK validation: carotid artery
  stenosis uses HP:0100546, amaurosis fugax uses HP:0100576, and treatment
  bindings avoid Falcon-suggested MAXO IDs that resolved locally to unrelated
  concepts. PR review follow-up replaced a systemic blood-circulation binding
  with GO:0001666 response to hypoxia for hemodynamic impairment, changed
  carotid artery stenting from a generic MAXO surgical-procedure binding to the
  local NCIT angioplasty term, added exact NCIT bindings for broad diagnostic
  imaging and CT angiography diagnoses, and added vulnerable plaque
  histopathology from the plaque-biology review.
📚

References & Deep Research

References

11
DOI:10.1007/s00270-024-03707-y
CIRSE Standards of Practice on Carotid Artery Stenting
No top-level findings curated for this source.
DOI:10.1016/j.ejvs.2022.04.011
Editor's Choice - European Society for Vascular Surgery (ESVS) 2023 Clinical Practice Guidelines on the Management of Atherosclerotic Carotid and Vertebral Artery Disease
No top-level findings curated for this source.
DOI:10.1055/a-2175-4029
Elective carotid stenting fulfills quality standards defined in guidelines
No top-level findings curated for this source.
DOI:10.1093/cvr/cvad135
Stroke risk management in carotid atherosclerotic disease: a clinical consensus statement of the ESC Council on Stroke and the ESC Working Group on Aorta and Peripheral Vascular Diseases
No top-level findings curated for this source.
DOI:10.1101/2023.09.25.23296124
Diagnostic accuracy of carotid plaque instability by noninvasive imaging: a systematic review and meta-analysis
No top-level findings curated for this source.
DOI:10.1136/jnis-2022-018732
Asymptomatic carotid artery stenosis: a summary of current state of evidence for revascularization and emerging high-risk features
No top-level findings curated for this source.
DOI:10.1161/str.0000000000000475
2024 Guideline for the Primary Prevention of Stroke: A Guideline From the American Heart Association/American Stroke Association
No top-level findings curated for this source.
DOI:10.1161/strokeaha.123.046894
Prediction of Severe Baseline Asymptomatic Carotid Stenosis and Subsequent Risk of Stroke and Cardiovascular Disease
No top-level findings curated for this source.
DOI:10.1590/1677-5449.202300942
Brazilian Angiology and Vascular Surgery Society Guidelines for the Treatment of Extracranial Cerebrovascular Disease
No top-level findings curated for this source.
DOI:10.3390/ijms25084351
Molecular Pathways of Vulnerable Carotid Plaques at Risk of Ischemic Stroke: A Narrative Review
No top-level findings curated for this source.
DOI:10.54522/jvsgbi.2024.156
Current practice in ultrasound grading of carotid artery stenosis in the UK and Ireland
No top-level findings curated for this source.

Deep Research

1
Falcon ▸
1. Disease Information
Edison Scientific Literature 44 citations 2026-05-06T15:23:47.588648

1. Disease Information

1.1 Concise overview

  • Asymptomatic carotid artery stenosis (aCAS) is defined as extracranial carotid stenosis “without a history of ipsilateral ischemic stroke or transient ischemic attack.” (kim2023asymptomaticcarotidartery pages 1-1)
  • “Symptomatic carotid disease” in guideline usage generally refers to carotid-territory ischemic events in a defined recent time window; e.g., one guideline defines symptomatic disease as ≥1 ischemic event in the carotid territory in the preceding 6 months. (ristow2024brazilianangiologyand pages 14-16)

1.2 Key identifiers (ontology/coding)

  • MeSH: Carotid Stenosis D016893. (NCT03121209 chunk 4, NCT02089217 chunk 6)
  • MeSH parent: Carotid Artery Diseases D002340. (NCT03121209 chunk 4, NCT06653387 chunk 3)
  • MONDO ID: Not found in the retrieved evidence set; requires direct MONDO lookup (not evidenced here). (artifact-00)
  • ICD-10/ICD-11: Not present in retrieved full text; requires direct ICD source lookup (not evidenced here). (artifact-00)

1.3 Synonyms and alternative names (clinical)

  • Carotid artery stenosis (CAS)
  • Internal carotid artery stenosis
  • Extracranial carotid atherosclerotic disease
  • High-grade carotid stenosis (often ≥70% by NASCET in interventional literature) (spiliopoulos2024cirsestandardsof pages 1-2)
  • Near-occlusion / “string sign” (definitions vary by modality and center) (trochowski2024currentpracticein pages 4-5, naylor2023editorschoice– pages 11-12)

1.4 Evidence provenance

This report synthesizes aggregated disease-level evidence from clinical practice guidelines, systematic reviews/meta-analyses, observational cohorts/registries, and ClinicalTrials.gov records rather than individual EHR case reports. (bushnell20242024guidelinefor pages 25-26, pakizer2024diagnosticaccuracyof pages 1-7, poorthuis2024predictionofsevere pages 1-2)

2. Etiology

2.1 Disease causal factors

  • Primary cause: atherosclerotic plaque development at the carotid bifurcation/ICA leading to progressive narrowing and embolic risk. (ristow2024brazilianangiologyand pages 14-16, miceli2024molecularpathwaysof pages 1-2)
  • Mechanistic cause of stroke: plaque rupture/ulceration → thrombus formation → artery-to-artery embolization; this can occur even with non-severe stenosis when plaque is “vulnerable”. (miceli2024molecularpathwaysof pages 1-2, musialek2025strokeriskmanagement pages 61-62)

2.2 Risk factors (human clinical/epidemiologic)

Direct, quantified risk-factor effect estimates (e.g., HR per smoking pack-year) were not extracted from the retrieved set. However, vascular risk-factor control is consistently emphasized as the cornerstone of modern management, and multiple studies incorporate common cardiovascular risk factors (hypertension, dyslipidemia, diabetes, smoking) in risk prediction and plaque vulnerability frameworks. (bushnell20242024guidelinefor pages 25-26, poorthuis2024predictionofsevere pages 1-2)

2.3 Protective factors

  • Statin-based lipid-lowering therapy is recommended/considered beneficial for reducing stroke risk in asymptomatic atherosclerotic carotid stenosis. (bushnell20242024guidelinefor pages 25-26)
  • In a guideline summary of PCSK9 inhibitor trials, evolocumab was reported to reduce ischemic stroke by 25% (95% CI 0.62–0.92). (ristow2024brazilianangiologyand pages 8-9)

2.4 Gene–environment interactions

No carotid-stenosis-specific gene–environment interaction study was retrieved; the disease is treated as complex/multifactorial with pleiotropic cardiometabolic genetic architecture and strong environmental/lifestyle contributions. (poorthuis2024predictionofsevere pages 1-2)

3. Phenotypes

3.1 Core clinical phenotypes (suggested HPO terms)

  • Transient ischemic attack — HP:0002323 (symptom/clinical event). (ristow2024brazilianangiologyand pages 14-16)
  • Ischemic stroke — HP:0002140 (complication/outcome). (ristow2024brazilianangiologyand pages 8-9)
  • Amaurosis fugax / transient monocular blindness — HP:0001107 (carotid-territory symptom; used in trial eligibility definitions). (NCT04547387 chunk 2)
  • Cognitive impairment (reported as an outcome/association in CREST-H condition ontology) — HP:0100543 (NCT03121209 chunk 4)

3.2 Imaging phenotypes (suggested HPO terms where applicable)

  • Carotid artery stenosis (phenotypic abnormality) — HP:0025492 (suggested).
  • Atherosclerotic plaque — HP:0033678 (suggested).
  • Intraplaque hemorrhage (IPH) — suggested as an imaging phenotype; MRI-based IPH is a high-risk feature used in guideline selection criteria. (ristow2024brazilianangiologyand pages 13-14)

3.3 Onset, progression, and frequency

  • aCAS is often discovered incidentally or via vascular screening in high-risk populations; a 2023 review reports population prevalence 0.1%–3.1%. (kim2023asymptomaticcarotidartery pages 1-2)
  • In a large 2024 registry-derived cohort, severe (≥70%) baseline asymptomatic stenosis prevalence was 6.3% (n=26,384). (poorthuis2024predictionofsevere pages 1-2)

3.4 Quality-of-life impact

Quality-of-life impact is largely mediated through neurologic events (TIA/stroke) and possible cognitive effects; CREST-H explicitly couples carotid stenosis with cognitive dysfunction as an outcome area. (NCT03121209 chunk 4)

4. Genetic/Molecular Information

4.1 Causal genes

Carotid stenosis is a complex disease; no single causal gene was identified in the retrieved evidence set, and no Mendelian carotid stenosis gene list (OMIM-style) was retrieved.

4.2 Polygenic architecture and cardiometabolic loci

A 2024 multi-trait genetic colocalization analysis identified shared loci across cardiovascular and cerebrovascular diseases linked to blood pressure, lipid traits, and carotid intima-media thickness (cIMT), mapping to genes including LDLR and SH2B3, among others—consistent with polygenic cardiometabolic mechanisms relevant to carotid atherosclerosis phenotypes. (poorthuis2024predictionofsevere pages 1-2)

4.3 Mendelian randomization (example)

A 2024 Mendelian randomization study reported no significant association between genetically predicted vitamin D status/deficiency and carotid plaque risk (e.g., OR≈1.0). This supports caution when inferring causality from observational vitamin D–atherosclerosis associations. (poorthuis2024predictionofsevere pages 1-2)

4.4 Molecular biomarkers and pathways (see Mechanism)

Recent molecular reviews emphasize inflammatory cytokines, oxidized LDL pathways, and extracellular-matrix proteolysis (e.g., MMPs) in plaque vulnerability. (miceli2024molecularpathwaysof pages 1-2, miceli2024molecularpathwaysof pages 2-3)

5. Environmental Information

5.1 Lifestyle/clinical risk environment

The retrieved guideline evidence centers on medical risk-factor management (lipids, antithrombotics, blood pressure) rather than discrete environmental toxicants. (bushnell20242024guidelinefor pages 25-26)

5.2 Infectious agents

No infectious etiology was identified or suggested in the retrieved evidence set.

6. Mechanism / Pathophysiology

6.1 Causal chain (atherosclerosis → stenosis → events)

  1. Atherogenesis in carotid artery wall with lipid accumulation and immune activation → plaque growth and luminal narrowing. (miceli2024molecularpathwaysof pages 1-2)
  2. Plaque vulnerability phenotype (thin fibrous cap, lipid-rich necrotic core, IPH, neovascularization, ulceration) increases rupture/embolization propensity, potentially even when stenosis is <50%. (miceli2024molecularpathwaysof pages 1-2)
  3. Rupture/ulceration → local thrombosis and embolization → TIA/stroke. (miceli2024molecularpathwaysof pages 1-2, miceli2024molecularpathwaysof pages 10-11)

A 2024 molecular review characterizes vulnerable plaque heterogeneity and notes an immune-mediated cascade culminating in “thromboinflammation.” (miceli2024molecularpathwaysof pages 1-2)

6.2 Key molecular pathways and mediators (examples)

  • Inflammatory cytokines/mediators: IL-6, IL-17 and others are described as elevated in unstable plaque contexts. (miceli2024molecularpathwaysof pages 2-3)
  • Oxidized LDL / lipid oxidation: oxidized LDL is highlighted as a lipid-related marker linked to instability and thrombogenicity. (miceli2024molecularpathwaysof pages 1-2)
  • Extracellular matrix remodeling: matrix metalloproteinases (e.g., MMP-9) contribute to fibrous-cap weakening by degrading collagen/elastin/proteoglycans. (miceli2024molecularpathwaysof pages 2-3)
  • Thrombotic/hemostatic coupling: platelet/coagulation interactions and fibrinolytic enzymes contribute to embolic risk. (miceli2024molecularpathwaysof pages 2-3)

6.3 Cell types (suggested Cell Ontology terms)

  • Vascular endothelial cell — CL:0000115 (endothelial dysfunction/leukocyte recruitment) (miceli2024molecularpathwaysof pages 2-3)
  • Vascular smooth muscle cell — CL:0000192 (cap stability/ECM production) (miceli2024molecularpathwaysof pages 5-7)
  • Macrophage — CL:0000235 (inflammation, protease secretion, lipid handling) (miceli2024molecularpathwaysof pages 5-7)
  • Platelet — CL:0000233 (thromboinflammation) (miceli2024molecularpathwaysof pages 10-11)

6.4 Suggested GO Biological Process terms (non-exhaustive)

  • Inflammatory response — GO:0006954 (miceli2024molecularpathwaysof pages 2-3)
  • Leukocyte migration — GO:0050900
  • Extracellular matrix disassembly — GO:0022617 (MMP activity) (miceli2024molecularpathwaysof pages 2-3)
  • Response to oxidative stress — GO:0006979 (miceli2024molecularpathwaysof pages 2-3)
  • Blood coagulation — GO:0007596 (miceli2024molecularpathwaysof pages 2-3)

6.5 Recent developments (2023–2024)

A major 2023–2024 theme is shifting from stenosis-percent thresholds alone to multi-parameter risk stratification incorporating vulnerable plaque imaging and biomarkers. A 2024 imaging meta-analysis supports that CT and MRI can detect vulnerable plaque with high accuracy compared with histology, enabling “stenosis and beyond” risk frameworks. (pakizer2024diagnosticaccuracyof pages 1-7)

7. Anatomical Structures Affected

7.1 Primary anatomy (suggested UBERON terms)

  • Common carotid artery — UBERON:0001649 (suggested)
  • Internal carotid artery — UBERON:0001647 (suggested)
  • Carotid bifurcation / carotid bulb region (site of plaque formation; suggested)

7.2 Secondary organs/systems

  • Brain/central nervous system: downstream ischemic injury causing TIA/stroke. (ristow2024brazilianangiologyand pages 8-9)

7.3 Subcellular/cellular compartments (suggested GO Cellular Component terms)

  • Extracellular matrix — GO:0031012 (ECM remodeling) (miceli2024molecularpathwaysof pages 2-3)

8. Temporal Development

8.1 Onset

Typically adult/older-adult onset as part of systemic atherosclerosis. (kim2023asymptomaticcarotidartery pages 1-2)

8.2 Progression

Atherosclerotic progression can be monitored by serial duplex ultrasound; AHA/ASA notes that for ACS >50%, surveillance every 6–12 months might be reasonable. (bushnell20242024guidelinefor pages 25-26)

9. Inheritance and Population

9.1 Epidemiology (recent quantitative evidence)

  • General prevalence: 0.1%–3.1% (2023 review). (kim2023asymptomaticcarotidartery pages 1-2)
  • High-risk registry cohort: 6.3% prevalence of severe (≥70%) baseline asymptomatic stenosis (2024). (poorthuis2024predictionofsevere pages 1-2)

9.2 Population burden and stroke attribution

A 2024 guideline summary reports that ischemic strokes constitute 80–85% of all strokes and that ~25% of ischemic strokes are associated with cervical carotid artery disease. (ristow2024brazilianangiologyand pages 8-9)

9.3 Inheritance pattern

Complex, polygenic; shared cardiometabolic genetic loci and pathways are implicated rather than single-gene inheritance. (poorthuis2024predictionofsevere pages 1-2)

10. Diagnostics

10.1 First-line imaging: duplex ultrasound (DUS)

Real-world practice uses velocity thresholds to grade stenosis, but inter-center variability persists. * In a 2024 UK/Ireland audit, common thresholds were PSV >125 cm/s for >50% stenosis and PSV >230 cm/s for >70% stenosis, with frequent use of PSV ratios (2–4 for moderate, >4 for severe). (trochowski2024currentpracticein pages 1-2)

Visual evidence (cropped table): duplex velocity thresholds and grading variability across centers are shown in a retrieved table image. (trochowski2024currentpracticein media 5fb82bca, trochowski2024currentpracticein media 4b772e98)

10.2 CTA/MRA corroboration

ESVS 2023 recommends corroborating DUS estimates with CTA/MRA (or repeat DUS by another operator) when considering CEA; and for CAS, recommends CTA/MRA to evaluate arch and extra-/intracranial circulation. (naylor2023editorschoice– pages 12-13)

10.3 Diagnostic performance (ESVS 2023 summary)

Compared with DSA reference, reported sensitivity/specificity are high for occlusion and moderate-to-high for stenosis by modality (DUS/CTA/CEMRA). (naylor2023editorschoice– pages 12-13)

10.4 Vulnerable plaque imaging (2024 evidence)

A 2024 systematic review/meta-analysis comparing noninvasive imaging to histology reports vulnerable plaque detection accuracy of MRI 90%, CT 86%, and US 80%, supporting greater use of CT/MRI compositional assessment for risk stratification. (pakizer2024diagnosticaccuracyof pages 1-7)

10.5 Differential diagnosis (high-level)

The retrieved evidence explicitly highlights entities that can mimic or extend “stenosis-only” paradigms (e.g., symptomatic non-stenotic carotid plaques) and emphasizes non-stenotic high-risk plaque features. (spiliopoulos2024cirsestandardsof pages 6-7)

10.6 Screening

AHA/ASA 2024: routine population screening is not recommended to reduce stroke risk. (bushnell20242024guidelinefor pages 25-26)

11. Outcome / Prognosis

11.1 Recent prognosis statistics

In a 2024 cohort (≈70,000 patient-years), there were 1,124 strokes and 2,484 cardiovascular events in a population used to validate a severe-ACAS prediction model; the burden concentrated in higher PACAS risk groups. (poorthuis2024predictionofsevere pages 1-2)

11.2 Procedural risks (CAS vs emergency CAS)

A 2024 real-world series reported in-hospital stroke/death of 0.8% after elective CAS in symptomatic patients, versus 7.8% complication rate for emergency CAS in acute stroke settings, emphasizing the importance of indication and context. (keil2024electivecarotidstenting pages 1-2)

12. Treatment

12.1 Medical therapy (best/intensive medical therapy)

AHA/ASA 2024 notes statin-based medical therapy is beneficial to reduce stroke risk in asymptomatic atherosclerotic carotid stenosis. (bushnell20242024guidelinefor pages 25-26)

12.2 Revascularization: CEA, CAS, and transcarotid approaches

  • AHA/ASA 2024: for asymptomatic extracranial carotid stenosis >70%, shared decision-making is recommended to choose between revascularization and medical management; effectiveness of revascularization in those at high perioperative risk is not established. (bushnell20242024guidelinefor pages 25-26)
  • CIRSE 2024: CAS has an established role, but evidence syntheses generally show higher peri-procedural stroke risk vs CEA and emphasize careful patient selection, embolic protection, blood pressure control, and structured follow-up. (spiliopoulos2024cirsestandardsof pages 6-7, spiliopoulos2024cirsestandardsof pages 7-9)

12.3 CAS best-practice elements (CIRSE 2024)

  • Recommended DAPT example regimen: aspirin 75–100 mg + clopidogrel 75 mg; aspirin continued indefinitely after one month (practice standard). (spiliopoulos2024cirsestandardsof pages 6-7)
  • Post-procedure surveillance: baseline DUS with follow-up at 1 and 6 months, then annually. (spiliopoulos2024cirsestandardsof pages 6-7)

12.4 TCAR and device innovation

ClinicalTrials.gov records show ongoing real-world implementation and evaluation of transcarotid neuroprotection systems, micromesh/covered stents, and TCAR strategies (e.g., NCT06653387; NCT04547387). (NCT06653387 chunk 3, NCT04547387 chunk 2)

12.5 Treatment ontology (suggested MAXO terms)

  • Carotid endarterectomy — MAXO:0000578 (suggested)
  • Carotid artery stenting — MAXO:0000793 (suggested)
  • Statin therapy — MAXO:0000746 (suggested)
  • Antiplatelet therapy — MAXO:0000744 (suggested)

13. Prevention

13.1 Primary prevention

AHA/ASA 2024 emphasizes prevention via evidence-based cardiovascular risk reduction; for carotid stenosis specifically it discourages routine screening and recommends statin-based therapy when asymptomatic stenosis is present. (bushnell20242024guidelinefor pages 25-26)

13.2 Secondary prevention / surveillance

For ACS >50%, periodic carotid DUS every 6–12 months might be reasonable to monitor progression and stroke risk. (bushnell20242024guidelinefor pages 25-26)

14. Other Species / Natural Disease

No retrieved primary evidence directly addressed naturally occurring carotid stenosis in non-human species or veterinary epidemiology; this section is therefore evidence-limited in the current tool-retrieved corpus.

15. Model Organisms

No retrieved primary evidence directly described dedicated carotid stenosis model organisms (e.g., mouse carotid flow-modification models) in a way that could be cited here; model-organism content is a gap in the retrieved evidence.

Key evidence tables

The following artifacts summarize identifiers and quantitative thresholds.

Concept/Identifier type Identifier/value Notes/definition snippet Source (PMID/DOI/URL) Publication year
MeSH D016893 — Carotid Stenosis MeSH term explicitly listed in CREST-related ClinicalTrials.gov records; placed under broader carotid artery/cerebrovascular disease hierarchy (NCT03121209 chunk 4, NCT05465122 chunk 2, NCT02089217 chunk 6, NCT05465122 chunk 3) ClinicalTrials.gov NCT03121209; NCT02089217; NCT05465122 2014–2022
Broader MeSH parent D002340 — Carotid Artery Diseases Ancestor term for carotid stenosis in trial ontology metadata; useful for broader disease mapping (NCT04547387 chunk 2, NCT03121209 chunk 4, NCT05465122 chunk 3, NCT06653387 chunk 3) ClinicalTrials.gov NCT04547387; NCT03121209; NCT05465122; NCT06653387 2018–2024
Clinical syndrome term Asymptomatic carotid artery stenosis (aCAS) Defined as stenosis of the extracranial carotid arteries without a history of ipsilateral ischemic stroke or transient ischemic attack; severe aCAS often referenced as ≥70% (kim2023asymptomaticcarotidartery pages 1-1) Kim et al. 2023, J NeuroInterv Surg. DOI: https://doi.org/10.1136/jnis-2022-018732 2023
Guideline clinical term Symptomatic carotid disease / symptomatic carotid stenosis Brazilian guideline defines symptomatic disease as one or more ischemic events in the carotid territory within the previous 6 months; includes index/recurrent/recent event terminology (ristow2024brazilianangiologyand pages 14-16) von Ristow et al. 2024. DOI: https://doi.org/10.1590/1677-5449.202300942 2024
Guideline measurement system NASCET stenosis measurement ESVS 2023 adopts NASCET unless otherwise stated; mapping given as NASCET 50% ≈ ECST 75% and NASCET 70% ≈ ECST 85% (naylor2023editorschoice– pages 11-12) Naylor et al. 2023. DOI: https://doi.org/10.1016/j.ejvs.2022.04.011 2023
Guideline synonym/alternative scale ECST stenosis measurement Alternative European measurement method cross-mapped to NASCET in ESVS 2023; relevant when harmonizing older literature and imaging reports (naylor2023editorschoice– pages 11-12) Naylor et al. 2023. DOI: https://doi.org/10.1016/j.ejvs.2022.04.011 2023
Guideline lesion subtype Chronic near-occlusion (CNO) / near-occlusion ESVS describes angiographic near-occlusion using ≥2 features: delayed contrast filling, collateral recruitment, smaller distal ipsilateral ICA vs contralateral ICA, or distal ICA diameter ≤ ipsilateral ECA (naylor2023editorschoice– pages 11-12) Naylor et al. 2023. DOI: https://doi.org/10.1016/j.ejvs.2022.04.011 2023
Imaging/diagnostic synonym High-grade carotid stenosis CIRSE notes high-grade stenosis is characterized as ≥70% by NASCET; symptomatic status linked to focal neurologic symptoms within prior 6 months (spiliopoulos2024cirsestandardsof pages 1-2) Spiliopoulos et al. 2024. DOI: https://doi.org/10.1007/s00270-024-03707-y 2024
ICD coding note ICD-10 commonly used clinically: I65.2 (Occlusion and stenosis of carotid artery) No retrieved evidence passage explicitly provided ICD text/code mapping, so this should be treated as a common clinical coding note requiring direct verification in ICD source before KB ingestion Not directly evidenced in retrieved context —
MONDO note MONDO ID not found in retrieved sources No MONDO identifier was present in the retrieved guideline, trial, or review evidence set for carotid stenosis (bushnell20242024guidelinefor pages 25-26, kim2023asymptomaticcarotidartery pages 1-1) Not available in retrieved sources —

Table: This table compiles key carotid stenosis identifiers, naming conventions, and core definitional terms from the retrieved evidence base. It is useful for normalizing disease labels across guidelines, trials, and ontology-linked knowledge base entries.

Domain Metric/threshold Population/setting Value(s) Source with URL/DOI Publication date/year
Epidemiology Severe asymptomatic carotid artery stenosis (ACAS) prevalence REACH-derived cohort, adults 45–80 years, no prior carotid procedures, n=26,384 Severe baseline ACAS (≥70%) in 1,662/26,384 = 6.3%; during ~70,000 patient-years: 1,124 strokes and 2,484 CVD events; high-risk PACAS group (27.7% of cohort) had 11.4% severe ACAS prevalence and accounted for 56.6% of incident strokes and 64.9% of incident CVD events (poorthuis2024predictionofsevere pages 1-2) Poorthuis et al., Stroke 2024. https://doi.org/10.1161/strokeaha.123.046894 2024
Epidemiology Population prevalence of asymptomatic carotid artery stenosis General population review of aCAS Estimated prevalence 0.1%–3.1%; population-attributable stroke risk 0.7% (kim2023asymptomaticcarotidartery pages 1-2, kim2023asymptomaticcarotidartery pages 1-1) Kim et al., J NeuroInterv Surg 2023. https://doi.org/10.1136/jnis-2022-018732 2023
Epidemiology Historic randomized trial outcomes in asymptomatic disease ACAS and ACST-1 trial populations ACAS: n=1,662; perioperative risk 2.3%; 5-year stroke 5.1% CEA vs 11.0% BMT. ACST-1: n=3,120; 5-year stroke 6.4% CEA vs 11.8% BMT. ACST-2: n=3,625; perioperative/study rates 3.7% CAS vs 2.7% CEA; 5-year 5.3% CAS vs 4.5% CEA (kim2023asymptomaticcarotidartery pages 1-2) Kim et al., J NeuroInterv Surg 2023. https://doi.org/10.1136/jnis-2022-018732 2023
Ultrasound grading Common threshold for moderate carotid stenosis UK & Ireland vascular units audit, 46 responding units For >50% stenosis: PSV >125 cm/s used by 81%; velocity ratio 2.0–4.0 used by 71%; EDV used by 36% (trochowski2024currentpracticein pages 2-3, trochowski2024currentpracticein pages 1-2, trochowski2024currentpracticein media 5fb82bca) Trochowski et al., J Vasc Soc Great Britain & Ireland 2024. https://doi.org/10.54522/jvsgbi.2024.156 2024
Ultrasound grading Common threshold for severe carotid stenosis UK & Ireland vascular units audit, 46 responding units For >70% stenosis: PSV >230 cm/s used by 90%; velocity ratio >4.0 used by 86%; EDV used by 43% (trochowski2024currentpracticein pages 4-5, trochowski2024currentpracticein pages 3-4, trochowski2024currentpracticein pages 1-2, trochowski2024currentpracticein media 4b772e98) Trochowski et al., J Vasc Soc Great Britain & Ireland 2024. https://doi.org/10.54522/jvsgbi.2024.156 2024
Ultrasound grading Near-occlusion/string sign criteria UK & Ireland vascular units audit Near-occlusion most often defined by narrow colour Doppler channel (89%) and velocity measurement (76%); a few units used <20 cm/s or >400 cm/s criteria; substantial variability remained (trochowski2024currentpracticein pages 4-5, trochowski2024currentpracticein media 5fb82bca) Trochowski et al., J Vasc Soc Great Britain & Ireland 2024. https://doi.org/10.54522/jvsgbi.2024.156 2024
Guidelines Diagnostic performance of noninvasive imaging for stenosis/occlusion ESVS 2023 guideline summary of DUS/CTA/CEMRA vs DSA For occlusion: DUS/CTA/CEMRA sensitivity 97/97/99%, specificity 99/99/99%. For stenosis: DUS sensitivity 89%, specificity 84%; CTA sensitivity 75–85%, specificity 93–96%; CEMRA sensitivity 94–95%, specificity 92–93% (naylor2023editorschoice– pages 12-13) Naylor et al., Eur J Vasc Endovasc Surg 2023. https://doi.org/10.1016/j.ejvs.2022.04.011 2023
Guidelines Stenosis measurement equivalence ESVS 2023 guideline NASCET 50% ≈ ECST 75%; NASCET 70% ≈ ECST 85% (naylor2023editorschoice– pages 11-12) Naylor et al., Eur J Vasc Endovasc Surg 2023. https://doi.org/10.1016/j.ejvs.2022.04.011 2023
Imaging vulnerable plaque Accuracy for detecting vulnerable plaque vs histology Systematic review/meta-analysis of CT, MRI, US Vulnerable plaque detection accuracy: MRI 90% (95% CI 82–95%), CT 86% (76–92%), US 80% (75–84%) (pakizer2024diagnosticaccuracyof pages 1-7) Pakizer et al., Eur Heart J Cardiovasc Imaging 2024. https://doi.org/10.1101/2023.09.25.23296124 2024
Imaging vulnerable plaque Sensitivity/specificity for vulnerable plaque Meta-analysis analysis 1 CT sensitivity/specificity/accuracy 86%/87%/86%; MRI 91%/91%/90%; US 84%/73%/80% (pakizer2024diagnosticaccuracyof pages 28-33) Pakizer et al., Eur Heart J Cardiovasc Imaging 2024. https://doi.org/10.1101/2023.09.25.23296124 2024
Imaging vulnerable plaque Accuracy for vulnerable plaque characteristics Meta-analysis analysis 2 Vulnerable characteristic accuracy: CT 89%, MRI 86%, US 77%; MRI visualized all 13 evaluated plaque characteristics (pakizer2024diagnosticaccuracyof pages 11-15, pakizer2024diagnosticaccuracyof pages 1-7) Pakizer et al., Eur Heart J Cardiovasc Imaging 2024. https://doi.org/10.1101/2023.09.25.23296124 2024
Treatment outcomes Recommended peri-procedural antiplatelet regimen after CAS CIRSE standards of practice DAPT recommended: aspirin 75–100 mg + clopidogrel 75 mg, with aspirin continued indefinitely after 1 month; surveillance DUS at 1 month, 6 months, then yearly (spiliopoulos2024cirsestandardsof pages 6-7, spiliopoulos2024cirsestandardsof pages 2-4) Spiliopoulos et al., Cardiovasc Intervent Radiol 2024. https://doi.org/10.1007/s00270-024-03707-y 2024
Treatment outcomes CAS 30-day mortality/stroke in modern series CIRSE guidance citing a 700-case series 3.3% 30-day mortality/stroke (spiliopoulos2024cirsestandardsof pages 6-7) Spiliopoulos et al., Cardiovasc Intervent Radiol 2024. https://doi.org/10.1007/s00270-024-03707-y 2024
Treatment outcomes Elective vs emergency CAS complications Single-center 2012–2022 experience; 141 elective CAS, 158 emergency CAS Elective symptomatic in-hospital stroke/death 0.8%; asymptomatic elective CAS 0 complications; emergency CAS procedure-related complications 7.8% (keil2024electivecarotidstenting pages 1-2) Keil et al., RöFo 2024. https://doi.org/10.1055/a-2175-4029 2024
Guidelines Screening and surveillance for asymptomatic extracranial carotid stenosis AHA/ASA primary prevention guideline Routine population screening not recommended; for ACS >70%, shared decision-making on revascularization vs medical management recommended; for ACS >50%, duplex ultrasound every 6–12 months might be reasonable; statin-based therapy beneficial (bushnell20242024guidelinefor pages 25-26) Bushnell et al., Stroke 2024. https://doi.org/10.1161/str.0000000000000475 2024
Epidemiology / Guidelines Global stroke burden and carotid contribution Brazilian guideline summary 12.2 million strokes/year globally; incidence increased 50% over 17 years; 80–85% of strokes are ischemic; around 25% of ischemic strokes are associated with cervical carotid artery disease (ristow2024brazilianangiologyand pages 8-9) von Ristow et al., J Vasc Bras 2024. https://doi.org/10.1590/1677-5449.202300942 2024
Treatment outcomes / Prevention Lipid-lowering trial estimates relevant to carotid/vascular prevention Brazilian guideline summary of PCSK9 evidence Evolocumab lowered combined outcomes by 15% (95% CI 0.79–0.92, p<0.001) and reduced ischemic stroke by 25% (95% CI 0.62–0.92, p<0.005); alirocumab reduced outcomes from 3.3% to 1.7% (OR 0.52, 95% CI 0.31–0.90, p=0.02) (ristow2024brazilianangiologyand pages 8-9) von Ristow et al., J Vasc Bras 2024. https://doi.org/10.1590/1677-5449.202300942 2024

Table: This table compiles recent numerical thresholds, prevalence estimates, imaging performance measures, treatment complication rates, and guideline recommendations relevant to carotid stenosis. It is useful as a quick-reference evidence summary for diagnostics, prognosis, and management.

Selected direct abstract quotes supporting key claims

  • On symptomatic non-stenotic disease: “Symptomatic non-stenotic carotid plaques (SyNC) are an under-researched and under-recognized source of stroke.” (keil2024electivecarotidstenting pages 2-3)
  • On vulnerable plaque concept and features: “Vulnerable plaques are characterized by… neovascularization; lipid-rich necrotic cores (LRNCs); intraplaque hemorrhage (IPH); thin fibrous caps; plaque surface ulceration…” and can matter “also in the case of non-significant (less than 50%) stenosis.” (miceli2024molecularpathwaysof pages 1-2)

Notes on evidence limitations (important for KB ingestion)

  • Formal ICD-10/ICD-11 and MONDO mappings were not present in the retrieved full text; they should be sourced directly from the respective coding/ontology databases rather than inferred. (artifact-00)
  • Several widely used stenosis-grade cutoffs and peri-procedural risk thresholds are discussed across guidelines, but the retrieved ESVS excerpts did not capture all numeric recommendations verbatim; where necessary, this report relies on other 2024 guideline sources and practice standards present in the retrieved corpus. (bushnell20242024guidelinefor pages 25-26, ristow2024brazilianangiologyand pages 13-14)

References

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