Ischemic Stroke (Complex Disease) — Disease Characteristics Research Report

Executive summary

Ischemic stroke (IS) is brain tissue infarction due to occlusion of cerebral blood flow (thrombosis/embolism), producing acute focal neurologic deficits and major global disability and mortality burden. Contemporary evidence highlights (i) persistently high absolute global burden despite improvements in age-standardized rates, (ii) hypertension and dyslipidemia (especially high systolic blood pressure and high LDL-cholesterol) as leading modifiable contributors to disability-adjusted life-years (DALYs), and (iii) large, real-world improvements in evidence-based acute care and secondary prevention processes in organized stroke systems (e.g., Get With The Guidelines–Stroke in the US). (zhu2025globalandregional pages 1-5, liu2025globalregionaland pages 1-2, bushnell20242024guidelinefor pages 2-3, li2024globalregionaland pages 1-2, xian2024twentyyearsof pages 3-4)

Table: This table compiles recent quantitative ischemic stroke burden estimates and selected prevention/care-quality metrics from major 2024 sources. It is useful for quickly comparing global burden with real-world U.S. improvements in evidence-based stroke care delivery.

1. Disease Information

1.1 Definition / overview (current understanding)

Ischemic stroke (also termed cerebral infarction) is caused primarily by thrombotic obstruction or embolic occlusion of cerebral vessels, leading to brain ischemia and tissue necrosis/infarction. (zhu2025globalandregional pages 1-5)

A widely used clinical/epidemiologic definition (as used in Global Burden of Disease [GBD] analyses aligned to WHO criteria) describes ischemic stroke as rapidly developing clinical signs of cerebral dysfunction due to occlusion of cerebral blood flow by thrombus/embolus, typically lasting >24 hours or leading to death; GBD also references the tissue-based concept of infarction-driven neurological dysfunction. (liu2025globalregionaland pages 1-2, liu2025epidemiologyandfuture pages 11-12)

1.2 Key identifiers (available from retrieved sources)

This run did not retrieve OMIM/Orphanet/MeSH/ICD records directly; therefore, formal code mappings are not provided here and should be added from ontology resources (e.g., MeSH D-codes; ICD-10 I63.).*

Identifiers and abbreviations commonly used in the epidemiology literature include: IS (ischemic stroke), DALYs, ASIR (age-standardized incidence rate), ASMR (age-standardized mortality rate), ASDR (age-standardized DALY rate). (zhu2025globalandregional pages 16-19)

1.3 Common synonyms / alternative names

• Ischemic stroke (IS) (liu2025globalregionaland pages 1-2)
• Cerebral infarction (zhu2025globalandregional pages 1-5)

1.4 Source of information

The evidence synthesized here is primarily from: - Aggregated, disease-level epidemiologic resources (GBD 2021–based analyses). (li2024globalregionaland pages 1-2, liu2025globalregionaland pages 1-2) - Aggregated clinical quality-improvement registry data (Get With The Guidelines–Stroke). (xian2024twentyyearsof pages 3-4) - Evidence-synthesizing clinical guideline documents (AHA/ASA 2024 primary prevention guideline). (bushnell20242024guidelinefor pages 2-3)

2. Etiology

2.1 Disease causal factors (mechanistic framing)

The proximal cause of ischemic stroke is cerebral blood flow interruption due to intravascular occlusion (thrombus/embolus), leading to ischemia and infarction/necrosis of downstream brain tissue. (zhu2025globalandregional pages 1-5, liu2025globalregionaland pages 1-2)

2.2 Risk factors (recent quantitative summaries)

GBD 2021–based analyses consistently identify metabolic/vascular risks as dominant contributors to ischemic stroke burden. - High systolic blood pressure and high LDL-cholesterol were the leading modifiable contributors to DALYs over 1990–2021 in a GBD 2021 systematic analysis. (liu2025globalregionaland pages 1-2) - A GBD 2019–based analysis (Neurology, 2023) identified seven major attributable risk factors: smoking and high-sodium diet (behavioral), plus high systolic blood pressure, high LDL cholesterol, kidney dysfunction, high fasting plasma glucose, and high BMI (metabolic). (fan2023globalburdenrisk pages 1-2)

Environmental and behavioral factors are also highlighted in GBD-based syntheses, including air pollution and smoking. (liu2025epidemiologyandfuture pages 11-12, zhu2025globalandregional pages 16-19)

2.3 Protective factors

AHA/ASA’s 2024 primary prevention guideline endorses Mediterranean dietary patterns (with nuts and olive oil highlighted in the evidence synthesis) for stroke risk reduction. (bushnell20242024guidelinefor pages 2-3)

2.4 Gene–environment interactions

Not established from the retrieved evidence in this run. GBD and guideline sources emphasize risk-factor synergy (e.g., metabolic + behavioral risks) but do not provide specific validated gene–environment interaction effect estimates in the extracted passages. (fan2023globalburdenrisk pages 1-2, bushnell20242024guidelinefor pages 2-3)

3. Phenotypes

The present run did not retrieve dedicated phenotype frequency studies or HPO-mapped clinical series; thus, phenotype frequencies and detailed HPO mapping are incomplete.

3.1 Core phenotype concept (high-level)

The defining clinical phenotype is an acute episode of neurological dysfunction due to focal infarction (classically focal deficits corresponding to vascular territory). (liu2025epidemiologyandfuture pages 11-12)

3.2 Quality-of-life impact (system-level proxy)

Large registry data show temporal improvements in discharge disposition after ischemic stroke (a proxy for early functional outcome): discharge to home increased from 44.1% (2003) to 50.6% (2022) and discharge to skilled nursing facilities decreased from 20.9% to 13.6% in GWTG-Stroke hospitals. (xian2024twentyyearsof pages 5-8)

3.3 Suggested HPO terms (placeholders; not evidence-mapped in this run)

• Hemiparesis (HP:0001269)
• Aphasia (HP:0002381)
• Dysarthria (HP:0001260)
• Dysphagia (HP:0002015)
• Visual field defect (HP:0001123)

These should be verified and frequency-annotated from primary clinical cohorts.

4. Genetic / Molecular Information

This run did not retrieve OMIM/ClinVar/HGMD/ClinGen evidence for monogenic stroke syndromes; therefore, causal genes/variants and ACMG classifications are not provided.

4.1 Current understanding (complex genetics)

Ischemic stroke is described as a complex, multifactorial disorder with both environmental and heritable components; epidemiology sources emphasize that GBD-based analyses do not capture all genetic contributors. (fan2023globalburdenrisk pages 1-2, zhu2025globalandregional pages 16-19)

5. Environmental Information

5.1 Environmental factors

Environmental pollution is repeatedly identified as a major contributor alongside hypertension and LDL-cholesterol in GBD-based ischemic stroke risk-attribution summaries. (zhu2025globalandregional pages 1-5, zhu2025globalandregional pages 12-16)

5.2 Lifestyle factors

Lifestyle and metabolic risks highlighted include smoking, high BMI, and high-sodium diet. (fan2023globalburdenrisk pages 1-2)

6. Mechanism / Pathophysiology

6.1 Causal chain (macro-to-micro)

A canonical upstream-to-downstream chain supported by the retrieved evidence is: 1) Thrombotic/embolic occlusion of cerebral blood flow → 2) focal cerebral ischemia → 3) tissue infarction/necrosis → 4) acute neurological dysfunction and disability. (zhu2025globalandregional pages 1-5, liu2025globalregionaland pages 1-2)

6.2 Biological processes and cell types (ontology suggestions; limited direct evidence in this run)

Because this run emphasized epidemiology/guidelines, mechanistic molecular pathways (e.g., excitotoxicity, oxidative stress, BBB disruption) were not extracted from primary mechanistic papers here.

Suggested GO biological process terms (to be evidence-validated): - GO:0006954 inflammatory response - GO:0008219 cell death - GO:0006281 DNA repair (secondary injury context)

Suggested CL cell types (to be evidence-validated): - Microglial cell (CL:0000129) - Astrocyte (CL:0000127) - Brain microvascular endothelial cell (CL:2000064)

7. Diagnostics

This run did not retrieve primary imaging guideline text or biomarker performance statistics; diagnostic details should be supplemented from acute stroke guideline documents and radiology literature.

8. Treatment

8.1 Real-world implementation and systems of care

The US Get With The Guidelines–Stroke (GWTG-Stroke) registry demonstrates large real-world improvements in evidence-based acute ischemic stroke workflows and secondary prevention processes from 2003–2022, including: - Anticoagulation for atrial fibrillation/flutter: 55.7% → 97.2%. - Smoking cessation counseling: 44.7% → 97.8%. - Dysphagia screening: 53.8% → 83.5%. - Arrive-by-3.5h/treat-by-4.5h thrombolysis measure: 15.2% → 92.9%. - Door-to-needle ≤60 min: 19.0% → 75.3%. These changes occurred across 7,837,849 stroke/TIA admissions from 2,865 hospitals and are presented as sustained improvements across performance measures. (xian2024twentyyearsof pages 3-4, xian2024twentyyearsof pages 1-2)

A figure depicting these temporal trends in key acute ischemic stroke care performance measures is provided in the source paper. (xian2024twentyyearsof media e6f60d86)

8.2 MAXO terms (suggested; not formally mapped in this run)

• Thrombolysis (MAXO:0001294)
• Mechanical thrombectomy / endovascular thrombectomy (MAXO term to be confirmed)
• Anticoagulant therapy (MAXO:0000436)
• Antiplatelet therapy (MAXO:0000435)
• Dysphagia screening/intervention (MAXO term to be confirmed)

9. Prevention

9.1 Primary prevention (AHA/ASA 2024 guideline highlights)

The AHA/ASA 2024 primary prevention guideline organizes prevention around the American Heart Association’s “Life’s Essential 8” domains: diet, physical activity, weight, sleep, blood sugar, blood pressure, lipids, and tobacco. (bushnell20242024guidelinefor pages 2-3)

Selected evidence-based prevention statements extracted from the guideline include: - Mediterranean diet is endorsed for stroke risk reduction (with nuts and olive oil emphasized in the evidence synthesis), while low-fat diets have shown little impact on stroke risk. (bushnell20242024guidelinefor pages 2-3) - Sedentary behavior: a new recommendation is to screen for sedentary behavior and counsel patients to avoid prolonged sedentary time. (bushnell20242024guidelinefor pages 2-3) - Blood pressure: randomized trial evidence summarized indicates single-drug BP control occurred in only ~30% of participants and most required 2–3 medications; accordingly, ≥2 antihypertensive medications are recommended when needed to achieve targets. (bushnell20242024guidelinefor pages 2-3)

9.2 Population-health rationale from burden data

Despite declining age-standardized mortality and DALY rates in many regions, absolute ischemic stroke case counts have increased substantially over 1990–2021 due to population growth and aging. (liu2025globalregionaland pages 1-2, zhu2025globalandregional pages 12-16)

10. Other Species / Natural Disease

Not established from retrieved evidence.

11. Model organisms

This run retrieved some model-system papers but did not extract detailed evidence passages on model recapitulation/limitations.

12. Outcomes / Prognosis

12.1 Registry-based short-term outcome trends (US)

In-hospital mortality for ischemic stroke in GWTG-Stroke hospitals declined from 5.8% to 4.2% across 2003–2022, alongside shifting discharge patterns (more direct home discharge, fewer SNF discharges). (xian2024twentyyearsof pages 4-5, xian2024twentyyearsof pages 5-8)

13–15. Remaining template elements

Several requested knowledge-base fields (MONDO ID, ICD/MeSH codes, detailed phenotype frequencies with HPO mapping, causal genes/variants with ClinVar/gnomAD allele frequencies, and comprehensive diagnostics/treatment trial effect sizes) were not retrievable from the specific documents accessed in this run. The report should be extended by targeted retrieval from ontology databases (MONDO/MeSH/ICD), clinical guidelines for acute management, and primary genetics/biomarker studies.

Direct quotes from abstracts (for key statements)

• AHA/ASA 2024 prevention guideline aim: “Ischemic and hemorrhagic strokes lead to significant disability but, most important, are preventable.” (bushnell20242024guidelinefor pages 2-3)
• GWTG-Stroke scale and performance improvement: the registry included “7,837,849 stroke cases… [and] sustained improvement in all performance metrics” with examples including “anticoagulation for atrial fibrillation (55.7% in 2003 to 97.2% in 2022)” and “door-to-needle time within 60 minutes (19.0%–75.3%).” (xian2024twentyyearsof pages 3-4)

Key URLs and publication dates (from retrieved sources)

• Li et al. “Global, regional, and national burden of ischemic stroke, 1990–2021…” eClinicalMedicine; published Sep 2024. https://doi.org/10.1016/j.eclinm.2024.102758 (li2024globalregionaland pages 1-2)
• Bushnell et al. “2024 Guideline for the Primary Prevention of Stroke…” Stroke; published Dec 2024. https://doi.org/10.1161/str.0000000000000475 (bushnell20242024guidelinefor pages 2-3)
• Xian et al. “Twenty Years of Sustained Improvement…” Stroke; published Nov 2024. https://doi.org/10.1161/strokeaha.124.048174 (xian2024twentyyearsof pages 3-4)

References

1. (zhu2025globalandregional pages 1-5): Weimin Zhu, Xiaxia He, Daochao Huang, Yiqing Jiang, Weijun Hong, Shaofa Ke, En Wang, Feng Wang, Xianwei Wang, Renfei Shan, Suzhi Liu, Yinghe Xu, and Yongpo Jiang. Global and regional burden of ischemic stroke disease from 1990 to 2021: an age-period-cohort analysis. Translational stroke research, Dec 2025. URL: https://doi.org/10.1007/s12975-024-01319-9, doi:10.1007/s12975-024-01319-9. This article has 32 citations and is from a peer-reviewed journal.

2. (liu2025globalregionaland pages 1-2): Sibo Liu, Yanzhao Li, Xiaoyan Lan, Long Wang, Hang Li, Dean Gu, Mengxing Wang, and Jinjie Liu. Global, regional, and national trends in ischaemic stroke burden and risk factors among adults aged 20 + years (1990–2021): a systematic analysis of data from the global burden of disease study 2021 with projections into 2050. Frontiers in Public Health, Apr 2025. URL: https://doi.org/10.3389/fpubh.2025.1567275, doi:10.3389/fpubh.2025.1567275. This article has 23 citations.

3. (bushnell20242024guidelinefor pages 2-3): Cheryl Bushnell, Walter N. Kernan, Anjail Z. Sharrief, Seemant Chaturvedi, John W. Cole, William K. Cornwell, Christine Cosby-Gaither, Sarah Doyle, Larry B. Goldstein, Olive Lennon, Deborah A. Levine, Mary Love, Eliza Miller, Mai Nguyen-Huynh, Jennifer Rasmussen-Winkler, Kathryn M. Rexrode, Nicole Rosendale, Satyam Sarma, Daichi Shimbo, Alexis N. Simpkins, Erica S. Spatz, Lisa R. Sun, Vin Tangpricha, Dawn Turnage, Gabriela Velazquez, and Paul K. Whelton. 2024 guideline for the primary prevention of stroke: a guideline from the american heart association/american stroke association. Stroke, Dec 2024. URL: https://doi.org/10.1161/str.0000000000000475, doi:10.1161/str.0000000000000475. This article has 332 citations and is from a highest quality peer-reviewed journal.

4. (li2024globalregionaland pages 1-2): Xin-yu Li, Xiang-meng Kong, Cheng-hao Yang, Zhi-feng Cheng, Jia-jie Lv, Hong Guo, and Xiao-hong Liu. Global, regional, and national burden of ischemic stroke, 1990–2021: an analysis of data from the global burden of disease study 2021. eClinicalMedicine, 75:102758, Sep 2024. URL: https://doi.org/10.1016/j.eclinm.2024.102758, doi:10.1016/j.eclinm.2024.102758. This article has 309 citations and is from a peer-reviewed journal.

5. (xian2024twentyyearsof pages 3-4): Ying Xian, Shen Li, Tian Jiang, Chandler D. Beon, Remy Poudel, Kathie Thomas, Mathew J. Reeves, Eric E. Smith, Jeffrey L. Saver, Kevin N. Sheth, Steven R. Messé, Lee H. Schwamm, and Gregg C. Fonarow. Twenty years of sustained improvement in quality of care and outcomes for patients hospitalized with stroke or transient ischemic attack: data from the get with the guidelines-stroke program. Stroke, 55:2599-2610, Nov 2024. URL: https://doi.org/10.1161/strokeaha.124.048174, doi:10.1161/strokeaha.124.048174. This article has 23 citations and is from a highest quality peer-reviewed journal.

6. (xian2024twentyyearsof pages 1-2): Ying Xian, Shen Li, Tian Jiang, Chandler D. Beon, Remy Poudel, Kathie Thomas, Mathew J. Reeves, Eric E. Smith, Jeffrey L. Saver, Kevin N. Sheth, Steven R. Messé, Lee H. Schwamm, and Gregg C. Fonarow. Twenty years of sustained improvement in quality of care and outcomes for patients hospitalized with stroke or transient ischemic attack: data from the get with the guidelines-stroke program. Stroke, 55:2599-2610, Nov 2024. URL: https://doi.org/10.1161/strokeaha.124.048174, doi:10.1161/strokeaha.124.048174. This article has 23 citations and is from a highest quality peer-reviewed journal.

7. (xian2024twentyyearsof pages 4-5): Ying Xian, Shen Li, Tian Jiang, Chandler D. Beon, Remy Poudel, Kathie Thomas, Mathew J. Reeves, Eric E. Smith, Jeffrey L. Saver, Kevin N. Sheth, Steven R. Messé, Lee H. Schwamm, and Gregg C. Fonarow. Twenty years of sustained improvement in quality of care and outcomes for patients hospitalized with stroke or transient ischemic attack: data from the get with the guidelines-stroke program. Stroke, 55:2599-2610, Nov 2024. URL: https://doi.org/10.1161/strokeaha.124.048174, doi:10.1161/strokeaha.124.048174. This article has 23 citations and is from a highest quality peer-reviewed journal.

8. (xian2024twentyyearsof pages 5-8): Ying Xian, Shen Li, Tian Jiang, Chandler D. Beon, Remy Poudel, Kathie Thomas, Mathew J. Reeves, Eric E. Smith, Jeffrey L. Saver, Kevin N. Sheth, Steven R. Messé, Lee H. Schwamm, and Gregg C. Fonarow. Twenty years of sustained improvement in quality of care and outcomes for patients hospitalized with stroke or transient ischemic attack: data from the get with the guidelines-stroke program. Stroke, 55:2599-2610, Nov 2024. URL: https://doi.org/10.1161/strokeaha.124.048174, doi:10.1161/strokeaha.124.048174. This article has 23 citations and is from a highest quality peer-reviewed journal.

9. (liu2025epidemiologyandfuture pages 11-12): Jiayu Liu, Aoxi Xu, Zhifeng Zhao, Bin Ren, Zhao Gao, Dandong Fang, Bo Hei, Junzhao Sun, Xiangyang Bao, Lin Ma, Xiaoque Zheng, Yuxin Wang, Hecheng Ren, Guan Wang, Li Zhu, and Jianning Zhang. Epidemiology and future trend predictions of ischemic stroke based on the global burden of disease study 1990–2021. Communications Medicine, Jul 2025. URL: https://doi.org/10.1038/s43856-025-00939-y, doi:10.1038/s43856-025-00939-y. This article has 35 citations and is from a peer-reviewed journal.

10. (zhu2025globalandregional pages 16-19): Weimin Zhu, Xiaxia He, Daochao Huang, Yiqing Jiang, Weijun Hong, Shaofa Ke, En Wang, Feng Wang, Xianwei Wang, Renfei Shan, Suzhi Liu, Yinghe Xu, and Yongpo Jiang. Global and regional burden of ischemic stroke disease from 1990 to 2021: an age-period-cohort analysis. Translational stroke research, Dec 2025. URL: https://doi.org/10.1007/s12975-024-01319-9, doi:10.1007/s12975-024-01319-9. This article has 32 citations and is from a peer-reviewed journal.

11. (fan2023globalburdenrisk pages 1-2): Jiahui Fan, Xiaoguang Li, Xueying Yu, Zhenqiu Liu, Yanfeng Jiang, Yibin Fang, Ming Zong, Chen Suo, Qiuhong Man, and Lize Xiong. Global burden, risk factor analysis, and prediction study of ischemic stroke, 1990–2030. Neurology, Jul 2023. URL: https://doi.org/10.1212/wnl.0000000000207387, doi:10.1212/wnl.0000000000207387. This article has 433 citations and is from a highest quality peer-reviewed journal.

12. (zhu2025globalandregional pages 12-16): Weimin Zhu, Xiaxia He, Daochao Huang, Yiqing Jiang, Weijun Hong, Shaofa Ke, En Wang, Feng Wang, Xianwei Wang, Renfei Shan, Suzhi Liu, Yinghe Xu, and Yongpo Jiang. Global and regional burden of ischemic stroke disease from 1990 to 2021: an age-period-cohort analysis. Translational stroke research, Dec 2025. URL: https://doi.org/10.1007/s12975-024-01319-9, doi:10.1007/s12975-024-01319-9. This article has 32 citations and is from a peer-reviewed journal.

13. (xian2024twentyyearsof media e6f60d86): Ying Xian, Shen Li, Tian Jiang, Chandler D. Beon, Remy Poudel, Kathie Thomas, Mathew J. Reeves, Eric E. Smith, Jeffrey L. Saver, Kevin N. Sheth, Steven R. Messé, Lee H. Schwamm, and Gregg C. Fonarow. Twenty years of sustained improvement in quality of care and outcomes for patients hospitalized with stroke or transient ischemic attack: data from the get with the guidelines-stroke program. Stroke, 55:2599-2610, Nov 2024. URL: https://doi.org/10.1161/strokeaha.124.048174, doi:10.1161/strokeaha.124.048174. This article has 23 citations and is from a highest quality peer-reviewed journal.