Mobitz Type I Atrioventricular Block

Heart Disorder MONDO:0020744 Pathograph 8 Heart Disorder

Mobitz type I atrioventricular block, also called Wenckebach block, is a second-degree atrioventricular conduction disorder characterized by progressive PR interval prolongation before a nonconducted atrial impulse.

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4
Pathophys.
4
Phenotypes
8
Pathograph
2
Treatments
5
References
1
Deep Research
⚙

Pathophysiology

4
Vagal Atrioventricular Nodal Suppression
Vagal or parasympathetic surges can slow sinus rate and suppress atrioventricular nodal conduction, producing a generally nodal form of Wenckebach physiology.
cardiac muscle cell link
cardiac conduction link ↓ DECREASED
Downstream
Progressive PR Interval Prolongation AV nodal suppression increases conduction delay across successive beats.
Show evidence (2 references)
PMID:39267806 SUPPORT Human Clinical
"The diagnosis of Mobitz type II block AVB requires a stable sinus rate, which is an important criterion because a vagal surge (generally benign) can cause simultaneous sinus slowing and AV nodal block, which can resemble Mobitz type II AVB."
Supports AV nodal conduction slowing, often vagally mediated, as the physiologic mechanism underlying Wenckebach-like atrioventricular block.
PMID:39123144 PARTIAL Human Clinical
"Remifentanil is known to cause sinus bradycardia, however, because it has a direct negative chronotropic effect on the cardiac conduction system and there is an indirect negative chronotropic effect via the parasympathetic nervous system."
Supports parasympathetic and direct conduction-system suppression as a reversible AV nodal depression mechanism.
Ischemic Atrioventricular Nodal Depression
Acute inferior myocardial infarction can produce ischemic atrioventricular nodal conduction depression with Wenckebach periodicity, converging on the progressive PR-prolongation cascade.
cardiac muscle cell link
cardiac conduction link ↓ DECREASED
Downstream
Progressive PR Interval Prolongation Ischemic atrioventricular nodal depression produces progressive conduction delay across successive beats.
Show evidence (1 reference)
PMID:2426663 SUPPORT Human Clinical
"We report on twelve patients with alternating Wenckebach periods (AWP) occurring during an acute inferior myocardial infarction (AIMI)."
This clinical series supports acute inferior myocardial infarction as an ischemic context for Wenckebach-type atrioventricular block.
Progressive PR Interval Prolongation
In Wenckebach periodicity, successive conducted beats show progressive PR interval lengthening before a nonconducted atrial impulse.
cardiac muscle cell link
cardiac conduction link ↓ DECREASED
Downstream
Nonconducted P Wave Progressive AV nodal conduction delay culminates in a nonconducted atrial impulse.
Show evidence (1 reference)
PMID:1109548 SUPPORT Human Clinical
"The classic pattern of the typical WP's consists of (1) progressive lengthening of the P-R intervals with the largest increment occuring in the second conducted beat"
Supports progressive PR interval lengthening as the defining Wenckebach conduction pattern.
Nonconducted P Wave
The Wenckebach cycle culminates in a nonconducted P wave and dropped ventricular beat, lowering the effective ventricular rate.
cardiac conduction link ↓ DECREASED
Downstream
Bradycardia Intermittent dropped beats can reduce ventricular rate and contribute to bradycardic symptoms.
Show evidence (1 reference)
PMID:1109548 SUPPORT Human Clinical
"the pause produced by the nonconducted P-wave is less than two P-P intervals."
Supports the nonconducted P wave as the dropped-beat event in Wenckebach periodicity.
⬡

Pathograph

Use the checkboxes to hide or show graph categories. Hover nodes for evidence and cross-linked metadata.
Pathograph: causal mechanism network for Mobitz Type I Atrioventricular Block 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

4
Cardiovascular 2
Bradycardia Bradycardia (HP:0001662)
Show evidence (1 reference)
PMID:39123144 SUPPORT Human Clinical
"Remifentanil is known to cause sinus bradycardia, however, because it has a direct negative chronotropic effect on the cardiac conduction system and there is an indirect negative chronotropic effect via the parasympathetic nervous system."
Supports bradycardia as a conduction-system manifestation that can accompany AV nodal depression.
Syncope Syncope (HP:0001279)
Show evidence (1 reference)
PMID:29493981 SUPPORT Other
"In general, patients with second degree AV block may have no symptoms or may experience symptoms like syncope and lightheadedness."
Supports syncope as a possible symptom of second-degree atrioventricular block, including Mobitz I presentations.
Other 2
Mobitz I Atrioventricular Block Mobitz I atrioventricular block (HP:0011707)
Show evidence (2 references)
PMID:29493981 SUPPORT Other
"There are two types of second-degree atrioventricular blocks: Mobitz type I, also known as, Wenckebach and Mobitz type II."
Supports Mobitz type I/Wenckebach as a recognized second-degree atrioventricular block phenotype.
PMID:39267806 SUPPORT Human Clinical
"Atypical forms of Wenckebach AVB may be misinterpreted as Mobitz type II AVB when a series of PR intervals are constant before the block."
Supports Wenckebach AV block as the ECG pattern represented by the Mobitz I phenotype and highlights diagnostic overlap.
Lightheadedness
Show evidence (1 reference)
PMID:29493981 SUPPORT Other
"In general, patients with second degree AV block may have no symptoms or may experience symptoms like syncope and lightheadedness."
Supports lightheadedness as a symptom of second-degree AV block, including Mobitz I presentations.
💊

Treatments

2
Atropine for Acute Reversible AV Nodal Block
Action: Pharmacotherapy NCIT:C15986
Agent: atropine ↗
Atropine may be used in acute vagally mediated or drug-associated AV nodal bradyarrhythmia while removing the reversible trigger; this is not evidence for chronic treatment of asymptomatic nodal Wenckebach.
Target Phenotypes: Bradycardia ↗
Show evidence (1 reference)
PMID:39123144 PARTIAL Human Clinical
"Remifentanil was immediately discontinued, and we administered atropine sulfate. Complete atrioventricular block was restored to sinus rhythm."
Supports atropine as acute pharmacotherapy in a reversible AV nodal block sequence that included Wenckebach-type AV block.
Pacemaker Therapy for Symptomatic or Hemodynamically Unstable Wenckebach
Action: pacemaker implantation MAXO:0009034
Pacemaker therapy can be used for symptomatic or hemodynamically unstable Wenckebach presentations, especially in acute ischemic or non-benign contexts; this is conditional and distinct from asymptomatic nodal Wenckebach, where pacing may be inappropriate.
Target Phenotypes: Syncope ↗ Bradycardia ↗
Show evidence (1 reference)
PMID:2426663 PARTIAL Human Clinical
"Pacemaker therapy was initiated prophylactically in two patients, because of syncope in six, because of hemodynamic deterioration in two, and for syncope and hemodynamic deterioration in two."
Supports pacemaker therapy in symptomatic or hemodynamically unstable alternating Wenckebach periods in acute inferior myocardial infarction.
{ }

Source YAML

click to show 
name: Mobitz Type I Atrioventricular Block
creation_date: "2026-05-06T03:18:07Z"
updated_date: "2026-05-06T03:18:07Z"
category: Heart Disorder
parents:
- Heart Disorder
disease_term:
  preferred_term: Mobitz type I atrioventricular block
  term:
    id: MONDO:0020744
    label: Mobitz type I atrioventricular block
description: >-
  Mobitz type I atrioventricular block, also called Wenckebach block, is a
  second-degree atrioventricular conduction disorder characterized by
  progressive PR interval prolongation before a nonconducted atrial impulse.
pathophysiology:
- name: Vagal Atrioventricular Nodal Suppression
  description: >-
    Vagal or parasympathetic surges can slow sinus rate and suppress
    atrioventricular nodal conduction, producing a generally nodal form of
    Wenckebach physiology.
  cell_types:
  - preferred_term: cardiac muscle cell
    term:
      id: CL:0000746
      label: cardiac muscle cell
  biological_processes:
  - preferred_term: cardiac conduction
    term:
      id: GO:0061337
      label: cardiac conduction
    modifier: DECREASED
  evidence:
  - reference: PMID:39267806
    reference_title: "Mobitz type II second-degree atrioventricular block: a commonly overdiagnosed and misinterpreted arrhythmia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      The diagnosis of Mobitz type II block AVB requires a stable sinus rate, which is an important criterion because a vagal surge (generally benign) can cause simultaneous sinus slowing and AV nodal block, which can resemble Mobitz type II AVB.
    explanation: >-
      Supports AV nodal conduction slowing, often vagally mediated, as the
      physiologic mechanism underlying Wenckebach-like atrioventricular block.
  - reference: PMID:39123144
    reference_title: "Repeated complete atrioventricular block during remifentanil administration in a pediatric patient with brain tumor and acute hydrocephalus: a case report."
    supports: PARTIAL
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Remifentanil is known to cause sinus bradycardia, however, because it has a direct negative chronotropic effect on the cardiac conduction system and there is an indirect negative chronotropic effect via the parasympathetic nervous system.
    explanation: Supports parasympathetic and direct conduction-system suppression as a reversible AV nodal depression mechanism.
  downstream:
  - target: Progressive PR Interval Prolongation
    description: AV nodal suppression increases conduction delay across successive beats.
- name: Ischemic Atrioventricular Nodal Depression
  description: >-
    Acute inferior myocardial infarction can produce ischemic atrioventricular
    nodal conduction depression with Wenckebach periodicity, converging on the
    progressive PR-prolongation cascade.
  cell_types:
  - preferred_term: cardiac muscle cell
    term:
      id: CL:0000746
      label: cardiac muscle cell
  biological_processes:
  - preferred_term: cardiac conduction
    term:
      id: GO:0061337
      label: cardiac conduction
    modifier: DECREASED
  evidence:
  - reference: PMID:2426663
    reference_title: "Alternating Wenckebach periods in acute inferior myocardial infarction: clinical, electrocardiographic, and therapeutic characterization."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      We report on twelve patients with alternating Wenckebach periods (AWP) occurring during an acute inferior myocardial infarction (AIMI).
    explanation: >-
      This clinical series supports acute inferior myocardial infarction as an
      ischemic context for Wenckebach-type atrioventricular block.
  downstream:
  - target: Progressive PR Interval Prolongation
    description: Ischemic atrioventricular nodal depression produces progressive conduction delay across successive beats.
- name: Progressive PR Interval Prolongation
  description: >-
    In Wenckebach periodicity, successive conducted beats show progressive PR
    interval lengthening before a nonconducted atrial impulse.
  cell_types:
  - preferred_term: cardiac muscle cell
    term:
      id: CL:0000746
      label: cardiac muscle cell
  biological_processes:
  - preferred_term: cardiac conduction
    term:
      id: GO:0061337
      label: cardiac conduction
    modifier: DECREASED
  evidence:
  - reference: PMID:1109548
    reference_title: The incidence of typical and atypical A-V Wenckebach periodicity.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      The classic pattern of the typical WP's consists of (1) progressive lengthening of the P-R intervals with the largest increment occuring in the second conducted beat
    explanation: Supports progressive PR interval lengthening as the defining Wenckebach conduction pattern.
  downstream:
  - target: Nonconducted P Wave
    description: Progressive AV nodal conduction delay culminates in a nonconducted atrial impulse.
- name: Nonconducted P Wave
  description: >-
    The Wenckebach cycle culminates in a nonconducted P wave and dropped
    ventricular beat, lowering the effective ventricular rate.
  biological_processes:
  - preferred_term: cardiac conduction
    term:
      id: GO:0061337
      label: cardiac conduction
    modifier: DECREASED
  evidence:
  - reference: PMID:1109548
    reference_title: The incidence of typical and atypical A-V Wenckebach periodicity.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      the pause produced by the nonconducted P-wave is less than two P-P intervals.
    explanation: Supports the nonconducted P wave as the dropped-beat event in Wenckebach periodicity.
  downstream:
  - target: Bradycardia
    description: Intermittent dropped beats can reduce ventricular rate and contribute to bradycardic symptoms.
phenotypes:
- name: Mobitz I Atrioventricular Block
  category: Cardiovascular
  phenotype_term:
    preferred_term: Mobitz I atrioventricular block
    term:
      id: HP:0011707
      label: Mobitz I atrioventricular block
  description: >-
    The electrocardiogram shows progressive PR interval prolongation followed
    by a dropped QRS complex.
  evidence:
  - reference: PMID:29493981
    reference_title: Second-Degree Atrioventricular Block.
    supports: SUPPORT
    evidence_source: OTHER
    snippet: >-
      There are two types of second-degree atrioventricular blocks: Mobitz type I, also known as, Wenckebach and Mobitz type II.
    explanation: Supports Mobitz type I/Wenckebach as a recognized second-degree atrioventricular block phenotype.
  - reference: PMID:39267806
    reference_title: "Mobitz type II second-degree atrioventricular block: a commonly overdiagnosed and misinterpreted arrhythmia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Atypical forms of Wenckebach AVB may be misinterpreted as Mobitz type II AVB when a series of PR intervals are constant before the block.
    explanation: Supports Wenckebach AV block as the ECG pattern represented by the Mobitz I phenotype and highlights diagnostic overlap.
- name: Bradycardia
  category: Cardiovascular
  phenotype_term:
    preferred_term: Bradycardia
    term:
      id: HP:0001662
      label: Bradycardia
  description: >-
    Intermittent dropped ventricular beats can produce a slow ventricular rate.
  evidence:
  - reference: PMID:39123144
    reference_title: "Repeated complete atrioventricular block during remifentanil administration in a pediatric patient with brain tumor and acute hydrocephalus: a case report."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Remifentanil is known to cause sinus bradycardia, however, because it has a direct negative chronotropic effect on the cardiac conduction system and there is an indirect negative chronotropic effect via the parasympathetic nervous system.
    explanation: Supports bradycardia as a conduction-system manifestation that can accompany AV nodal depression.
- name: Syncope
  category: Cardiovascular
  phenotype_term:
    preferred_term: Syncope
    term:
      id: HP:0001279
      label: Syncope
  description: >-
    Symptomatic episodes may occur when bradycardia causes transient cerebral
    hypoperfusion.
  evidence:
  - reference: PMID:29493981
    reference_title: Second-Degree Atrioventricular Block.
    supports: SUPPORT
    evidence_source: OTHER
    snippet: >-
      In general, patients with second degree AV block may have no symptoms or may experience symptoms like syncope and lightheadedness.
    explanation: Supports syncope as a possible symptom of second-degree atrioventricular block, including Mobitz I presentations.
- name: Lightheadedness
  category: Cardiovascular
  description: >-
    Presyncopal lightheadedness may occur when intermittent dropped beats reduce
    cardiac output without causing frank syncope.
  phenotype_term:
    preferred_term: Lightheadedness
  evidence:
  - reference: PMID:29493981
    reference_title: Second-Degree Atrioventricular Block.
    supports: SUPPORT
    evidence_source: OTHER
    snippet: >-
      In general, patients with second degree AV block may have no symptoms or may experience symptoms like syncope and lightheadedness.
    explanation: Supports lightheadedness as a symptom of second-degree AV block, including Mobitz I presentations.
diagnosis:
- name: Electrocardiographic recognition of Wenckebach periodicity
  description: >-
    Diagnosis is made from ECG evidence of a second-degree AV block pattern,
    with attention to PR interval behavior and sinus-rate stability to avoid
    misclassifying vagal Wenckebach as Mobitz II block.
  diagnosis_term:
    preferred_term: electrocardiography
    term:
      id: MAXO:0000900
      label: electrocardiography
  results: Progressive PR interval prolongation followed by a nonconducted atrial impulse supports Mobitz I/Wenckebach block.
  evidence:
  - reference: PMID:1109548
    reference_title: The incidence of typical and atypical A-V Wenckebach periodicity.
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      The classic pattern of the typical WP's consists of (1) progressive lengthening of the P-R intervals with the largest increment occuring in the second conducted beat
    explanation: Supports progressive PR interval lengthening as a direct ECG criterion for Wenckebach periodicity.
  - reference: PMID:39267806
    reference_title: "Mobitz type II second-degree atrioventricular block: a commonly overdiagnosed and misinterpreted arrhythmia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      A 2:1 AVB cannot be classified in terms of type I or type II AVB.
    explanation: Supports careful ECG-based differential diagnosis when conduction patterns are ambiguous.
treatments:
- name: Atropine for Acute Reversible AV Nodal Block
  treatment_term:
    preferred_term: Pharmacotherapy
    term:
      id: NCIT:C15986
      label: Pharmacotherapy
    therapeutic_agent:
    - preferred_term: atropine
      term:
        id: CHEBI:16684
        label: atropine
  description: >-
    Atropine may be used in acute vagally mediated or drug-associated AV nodal
    bradyarrhythmia while removing the reversible trigger; this is not evidence
    for chronic treatment of asymptomatic nodal Wenckebach.
  target_phenotypes:
  - preferred_term: Bradycardia
    term:
      id: HP:0001662
      label: Bradycardia
  evidence:
  - reference: PMID:39123144
    reference_title: "Repeated complete atrioventricular block during remifentanil administration in a pediatric patient with brain tumor and acute hydrocephalus: a case report."
    supports: PARTIAL
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Remifentanil was immediately discontinued, and we administered atropine sulfate. Complete atrioventricular block was restored to sinus rhythm.
    explanation: Supports atropine as acute pharmacotherapy in a reversible AV nodal block sequence that included Wenckebach-type AV block.
- name: Pacemaker Therapy for Symptomatic or Hemodynamically Unstable Wenckebach
  treatment_term:
    preferred_term: pacemaker implantation
    term:
      id: MAXO:0009034
      label: pacemaker implantation
  description: >-
    Pacemaker therapy can be used for symptomatic or hemodynamically unstable
    Wenckebach presentations, especially in acute ischemic or non-benign
    contexts; this is conditional and distinct from asymptomatic nodal
    Wenckebach, where pacing may be inappropriate.
  target_phenotypes:
  - preferred_term: Syncope
    term:
      id: HP:0001279
      label: Syncope
  - preferred_term: Bradycardia
    term:
      id: HP:0001662
      label: Bradycardia
  evidence:
  - reference: PMID:2426663
    reference_title: "Alternating Wenckebach periods in acute inferior myocardial infarction: clinical, electrocardiographic, and therapeutic characterization."
    supports: PARTIAL
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Pacemaker therapy was initiated prophylactically in two patients, because of syncope in six, because of hemodynamic deterioration in two, and for syncope and hemodynamic deterioration in two.
    explanation: Supports pacemaker therapy in symptomatic or hemodynamically unstable alternating Wenckebach periods in acute inferior myocardial infarction.
references:
- reference: PMID:39267806
  title: "Mobitz type II second-degree atrioventricular block: a commonly overdiagnosed and misinterpreted arrhythmia."
  findings: []
- reference: PMID:29493981
  title: Second-Degree Atrioventricular Block.
  findings: []
- reference: PMID:39123144
  title: "Repeated complete atrioventricular block during remifentanil administration in a pediatric patient with brain tumor and acute hydrocephalus: a case report."
  findings: []
- reference: PMID:1109548
  title: The incidence of typical and atypical A-V Wenckebach periodicity.
  findings: []
- reference: PMID:2426663
  title: "Alternating Wenckebach periods in acute inferior myocardial infarction: clinical, electrocardiographic, and therapeutic characterization."
  findings: []
📚

References & Deep Research

References

5
PMID:39267806
Mobitz type II second-degree atrioventricular block: a commonly overdiagnosed and misinterpreted arrhythmia.
No top-level findings curated for this source.
PMID:29493981
Second-Degree Atrioventricular Block.
No top-level findings curated for this source.
PMID:39123144
Repeated complete atrioventricular block during remifentanil administration in a pediatric patient with brain tumor and acute hydrocephalus: a case report.
No top-level findings curated for this source.
PMID:1109548
The incidence of typical and atypical A-V Wenckebach periodicity.
No top-level findings curated for this source.
PMID:2426663
Alternating Wenckebach periods in acute inferior myocardial infarction: clinical, electrocardiographic, and therapeutic characterization.
No top-level findings curated for this source.

Deep Research

1
Falcon ▸
Disease Characteristics Research Template
Edison Scientific Literature 55 citations 2026-05-05T23:48:28.675419

Question: You are an expert researcher providing comprehensive, well-cited information.

Provide detailed information focusing on: 1. Key concepts and definitions with current understanding 2. Recent developments and latest research (prioritize 2023-2024 sources) 3. Current applications and real-world implementations 4. Expert opinions and analysis from authoritative sources 5. Relevant statistics and data from recent studies

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Disease Characteristics Research Template

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  • Disease Name: Mobitz Type I Atrioventricular Block
  • MONDO ID: (if available)
  • Category: Heart Disorder

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  • Spatial transcriptomics findings > Search first: GEO, Spatial Research, Vizgen, 10x Genomics data
  • Multi-omics integration results > Search first: TCGA, ICGC, cBioPortal, LinkedOmics, PubMed
  • Functional genomics screens (CRISPR, RNAi) > Search first: DepMap, GenomeRNAi, PubMed, BioGRID ORCS

For each mechanism, describe: - The causal chain from initial trigger to clinical manifestation - Which mechanisms are upstream vs downstream - What cell types and biological processes are involved - Suggest GO terms for biological processes and CL terms for cell types

7. Anatomical Structures Affected

  • Organ Level:
  • Primary organs directly affected
  • Secondary organ involvement (complications, secondary effects)
  • Body systems involved (cardiovascular, nervous, digestive, respiratory, endocrine, etc.)

    Search first: Uberon, FMA (Foundational Model of Anatomy), OMIM, HPO, ICD-11, MeSH, SNOMED CT

  • Tissue and Cell Level:
  • Specific tissue types affected (epithelial, connective, muscle, nervous)
  • Specific cell populations targeted (with Cell Ontology terms)

    Search first: Uberon, Human Protein Atlas, Cell Ontology, Human Cell Atlas, CellMarker, PanglaoDB

  • Subcellular Level:
  • Cellular compartments involved (mitochondria, nucleus, ER, lysosomes) (with GO Cellular Component terms)

    Search first: Gene Ontology (Cellular Component), UniProt, Human Protein Atlas

  • Localization:
  • Specific anatomical sites (with UBERON terms) > Search first: FMA, Uberon, NeuroNames (for brain), SNOMED CT
  • Lateralization (unilateral, bilateral, asymmetric) > Search first: HPO, clinical literature, imaging databases

8. Temporal Development

  • Onset:
  • Typical age of onset (congenital, pediatric, adult, geriatric)
  • Onset pattern (acute, subacute, chronic, insidious)

    Search first: OMIM, Orphanet, HPO, PubMed

  • Progression:
  • Disease stages (early, intermediate, advanced, end-stage) > Search first: Cancer Staging Manual (AJCC), WHO classifications, PubMed
  • Progression rate (rapid, slow, variable)
  • Disease course pattern (episodic, relapsing-remitting, progressive, stable)
  • Disease duration (self-limited, chronic lifelong)

    Search first: Disease registries, longitudinal cohort databases, natural history studies, PubMed, Orphanet, OMIM

  • Patterns:
  • Remission patterns (spontaneous, treatment-induced) > Search first: Clinical trial databases, disease registries, PubMed
  • Critical periods (time windows of vulnerability or opportunity for intervention) > Search first: PubMed, developmental biology databases, clinical guidelines

9. Inheritance and Population

  • Epidemiology:
  • Prevalence (cases per 100,000 at given time)
  • Incidence (new cases per 100,000 per year)

    Search first: Orphanet, CDC, WHO, GBD (Global Burden of Disease), national registries, SEER, disease registries

  • For Genetic Etiology:
  • Inheritance pattern (AD, AR, X-linked, mitochondrial, multifactorial, polygenic) > Search first: OMIM, Orphanet, ClinVar, GTR (Genetic Testing Registry)
  • Penetrance (complete, incomplete, age-dependent) > Search first: ClinVar, OMIM, PubMed, ClinGen
  • Expressivity (variable, consistent) > Search first: OMIM, ClinVar, PubMed
  • Genetic anticipation (increasing severity in successive generations) > Search first: OMIM, PubMed (especially for repeat expansion disorders)
  • Germline mosaicism > Search first: ClinVar, OMIM, genetic counseling literature, PubMed
  • Founder effects (population-specific mutations) > Search first: gnomAD, population genetics databases, PubMed
  • Consanguinity role > Search first: OMIM, population studies, genetic counseling resources
  • Carrier frequency > Search first: gnomAD, carrier screening databases, GeneReviews, GTR
  • Population Demographics:
  • Affected populations (ethnic or demographic groups with higher prevalence) > Search first: gnomAD, 1000 Genomes, PAGE Study, PubMed, population registries
  • Geographic distribution (endemic areas, regional variation) > Search first: WHO, CDC, GBD, Orphanet, geographic epidemiology databases
  • Geographic distribution of specific variants
  • Sex ratio (male:female) > Search first: Disease registries, OMIM, PubMed, epidemiological databases
  • Age distribution of affected individuals > Search first: CDC, disease registries, SEER, Orphanet

10. Diagnostics

  • Clinical Tests:
  • Laboratory tests (blood, urine, tissue chemistry, specific enzyme assays) > Search first: LOINC, LabTests Online, PubMed
  • Biomarkers (proteins, metabolites, genetic markers, circulating biomarkers) > Search first: FDA Biomarker List, BEST (Biomarkers, EndpointS, and other Tools), PubMed
  • Imaging studies (X-ray, CT, MRI, PET, ultrasound) > Search first: RadLex, DICOM, Radiopaedia, imaging databases
  • Functional tests (pulmonary function, cardiac stress tests) > Search first: LOINC, clinical guidelines, PubMed
  • Electrophysiology (EEG, EMG, ECG, nerve conduction studies) > Search first: LOINC, clinical neurophysiology databases, PubMed
  • Biopsy findings (histopathology, immunohistochemistry) > Search first: SNOMED CT, College of American Pathologists resources, PubMed
  • Pathology findings (microscopic examination) > Search first: SNOMED CT, Digital Pathology databases, PubMed
  • Genetic Testing:

    Search first: GTR (Genetic Testing Registry), GeneReviews, ClinGen

  • Overview of recommended genetic testing approach
  • Whole genome sequencing (WGS) utility > Search first: GTR, ClinVar, GEL (Genomics England), gnomAD
  • Whole exome sequencing (WES) utility > Search first: GTR, ClinVar, OMIM, GeneMatcher
  • Gene panels (which panels, which genes) > Search first: GTR, ClinVar, laboratory-specific databases
  • Single gene testing > Search first: GTR, ClinVar, OMIM, GeneReviews
  • Chromosomal microarray (CMA) > Search first: DECIPHER, ClinVar, dbVar, ECARUCA
  • Karyotyping > Search first: Chromosome Abnormality Database, ClinVar, cytogenetics resources
  • FISH > Search first: ClinVar, cytogenetics databases, PubMed
  • Mitochondrial DNA testing > Search first: MITOMAP, MSeqDR, ClinVar, GTR
  • Repeat expansion testing > Search first: GTR, ClinVar, repeat expansion databases, PubMed
  • Omics-Based Diagnostics (if applicable):
  • RNA sequencing / transcriptomics > Search first: GEO, ArrayExpress, GTEx, RNA-seq databases
  • Proteomics > Search first: PRIDE, ProteomeXchange, FDA Biomarker database
  • Metabolomics > Search first: MetaboLights, Metabolomics Workbench, HMDB
  • Epigenomics > Search first: GEO, ENCODE, Roadmap Epigenomics, MethBase
  • Liquid biopsy > Search first: COSMIC, ClinVar, liquid biopsy databases, PubMed
  • Clinical Criteria:
  • Standardized diagnostic criteria (DSM, ICD, society guidelines) > Search first: DSM-5, ICD-11, clinical society guidelines, UpToDate
  • Differential diagnosis (other conditions to rule out, with distinguishing features) > Search first: DynaMed, UpToDate, clinical decision support systems
  • Screening:
  • Screening methods for asymptomatic individuals (newborn screening, carrier screening, cascade screening) > Search first: ACMG recommendations, CDC newborn screening, GTR

11. Outcome/Prognosis

  • Survival and Mortality:
  • Survival rate (5-year, 10-year, overall) > Search first: SEER, cancer registries, disease-specific registries, PubMed
  • Life expectancy (with and without treatment if applicable) > Search first: Orphanet, disease registries, actuarial databases, PubMed
  • Mortality rate > Search first: CDC, WHO, GBD, national mortality databases
  • Disease-specific mortality (deaths directly attributable to disease) > Search first: Disease registries, CDC Wonder, GBD, PubMed
  • Morbidity and Function:
  • Morbidity (disease-related disability and health impacts) > Search first: GBD, WHO, disability databases, PubMed
  • Disability outcomes (long-term functional impairments) > Search first: ICF (International Classification of Functioning), disability registries
  • Quality of life measures (EQ-5D, SF-36, PROMIS, disease-specific tools) > Search first: EQ-5D database, SF-36, PROMIS, PubMed
  • Disease Course:
  • Complications (secondary problems: infections, organ failure, etc.) > Search first: ICD codes, disease registries, clinical databases, PubMed
  • Recovery potential (likelihood and extent of recovery, with vs without treatment) > Search first: Natural history studies, rehabilitation databases, PubMed
  • Prediction:
  • Prognostic factors (age, disease severity, biomarkers, treatment response) > Search first: Prognostic models databases, clinical calculators, PubMed
  • Prognostic biomarkers (molecular markers predicting disease course) > Search first: FDA Biomarker database, PubMed, cancer prognostic databases

12. Treatment

  • Pharmacotherapy:
  • Pharmacological treatments (drug names, drug classes, mechanisms of action) > Search first: DrugBank, RxNorm, ATC classification, DailyMed, FDA databases
  • Pharmacogenomics (how genetic variants affect drug metabolism, efficacy, toxicity) > Search first: PharmGKB, CPIC (Clinical Pharmacogenetics), FDA Table of PGx Biomarkers
  • Advanced Therapeutics:
  • Gene therapy (viral vectors, CRISPR, gene replacement, gene editing) > Search first: ClinicalTrials.gov, FDA gene therapy database, ASGCT resources
  • Cell therapy (stem cell transplant, CAR-T, cellular therapeutics) > Search first: ClinicalTrials.gov, FDA cell therapy database, FACT standards
  • RNA-based therapies (ASOs, siRNA, mRNA therapies) > Search first: ClinicalTrials.gov, FDA approvals, PubMed
  • Targeted therapies (treatments directed at specific molecular targets) > Search first: My Cancer Genome, OncoKB, ClinicalTrials.gov, FDA approvals
  • Immunotherapies (checkpoint inhibitors, monoclonal antibodies) > Search first: Cancer Immunotherapy Database, FDA approvals, ClinicalTrials.gov
  • Surgical and Interventional:
  • Surgical interventions (types of surgery, timing, outcomes) > Search first: CPT codes, surgical registries, clinical guidelines, PubMed
  • Supportive and Rehabilitative:
  • Supportive care (symptom management, pain control, nutrition) > Search first: Clinical guidelines, Cochrane Library, PubMed
  • Rehabilitation (physical therapy, occupational therapy, speech therapy) > Search first: Rehabilitation medicine databases, clinical guidelines, PubMed
  • Experimental:
  • Experimental treatments in clinical trials (with NCT identifiers if available) > Search first: ClinicalTrials.gov, EU Clinical Trials Register, WHO ICTRP
  • Treatment Outcomes:
  • Treatment response rates > Search first: Clinical trial databases, FDA reviews, systematic reviews, PubMed
  • Side effects and adverse events > Search first: FDA Adverse Event Reporting System (FAERS), MedWatch, PubMed
  • Treatment Strategy:
  • Treatment algorithms (clinical pathways, decision trees) > Search first: Clinical practice guidelines, NCCN Guidelines, UpToDate
  • Combination therapies > Search first: ClinicalTrials.gov, treatment guidelines, PubMed
  • Personalized medicine approaches (genotype-guided treatment) > Search first: My Cancer Genome, CIViC, PharmGKB, precision medicine databases

For each treatment, suggest MAXO (Medical Action Ontology) terms where applicable.

13. Prevention

  • Prevention Levels:
  • Primary prevention (preventing disease occurrence: vaccination, risk factor modification) > Search first: CDC, WHO, USPSTF recommendations, Cochrane Library
  • Secondary prevention (early detection and treatment: screening programs, early intervention) > Search first: USPSTF, CDC screening guidelines, WHO
  • Tertiary prevention (preventing complications in those with disease) > Search first: Clinical guidelines, disease management protocols, PubMed
  • Immunization: Vaccine strategies (if applicable)

    Search first: CDC vaccine schedules, WHO immunization, FDA vaccine database

  • Screening and Early Detection:
  • Screening programs (population-based: newborn screening, cancer screening) > Search first: CDC screening programs, USPSTF, cancer screening databases
  • Genetic screening (carrier screening, preimplantation genetic diagnosis, prenatal testing) > Search first: ACMG recommendations, ACOG guidelines, GTR
  • Risk stratification (identifying high-risk individuals for targeted prevention) > Search first: Risk prediction models, clinical calculators, PubMed
  • Behavioral Interventions: Lifestyle modifications to reduce risk

    Search first: CDC, WHO, behavioral intervention databases, Cochrane Library

  • Counseling: Genetic counseling (risk assessment, family planning guidance)

    Search first: NSGC resources, ACMG guidelines, GeneReviews

  • Public Health:
  • Public health interventions (sanitation, vector control, health education) > Search first: CDC, WHO, public health databases, PubMed
  • Environmental interventions (reducing environmental risk factors) > Search first: EPA databases, WHO environmental health, PubMed
  • Prophylaxis: Preventive medications or procedures

    Search first: Clinical guidelines, FDA approvals, PubMed

14. Other Species / Natural Disease

  • Taxonomy: Species affected (with NCBI Taxon identifiers)

    Search first: NCBI Taxonomy

  • Breed: Specific breeds affected (with VBO identifiers if applicable)

    Search first: VBO (Vertebrate Breed Ontology)

  • Gene: Orthologous genes in other species (with NCBI Gene IDs)

    Search first: NCBI Gene

  • Natural Disease:
  • Naturally occurring disease in other species (companion animals, wildlife) > Search first: OMIA (Online Mendelian Inheritance in Animals), VetCompass, PubMed
  • Veterinary relevance and importance in animal health > Search first: OMIA, veterinary databases, PubMed
  • Comparative Biology:
  • Comparative pathology (similarities and differences across species) > Search first: OMIA, comparative pathology databases, PubMed
  • Evolutionary conservation of disease mechanisms > Search first: HomoloGene, OrthoMCL, Alliance of Genome Resources
  • Transmission (if applicable):
  • Zoonotic potential > Search first: CDC zoonotic diseases, WHO zoonoses, GIDEON
  • Cross-species susceptibility > Search first: NCBI Taxonomy, veterinary databases, PubMed

15. Model Organisms

  • Model Types:
  • Model organism type (mammalian, invertebrate, cellular, in vitro) > Search first: Alliance of Genome Resources, model organism databases
  • Specific model systems (mouse, rat, zebrafish, Drosophila, C. elegans, yeast, cell lines, organoids, iPSCs) > Search first: MGI, RGD, ZFIN, FlyBase, WormBase, SGD, ATCC, Cellosaurus
  • Induced models (drug treatment, surgical intervention, environmental manipulation) > Search first: MGI, model organism databases, PubMed
  • Genetic Models:
  • Types available (knockout, knock-in, transgenic, conditional, humanized) > Search first: MGI, IMPC, KOMP, EuMMCR, IMSR
  • Model Characteristics:
  • Phenotype recapitulation (how well model reproduces human disease features) > Search first: Model organism databases, comparative studies, PubMed
  • Model limitations (aspects of human disease not captured) > Search first: Model organism databases, PubMed, review articles
  • Applications:
  • Research applications (what aspects of disease can be studied) > Search first: Model organism databases, PubMed
  • Resources:
  • Model databases > Search first: MGI, RGD, ZFIN, FlyBase, WormBase, IMSR, EMMA, MMRRC

Citation Requirements

  • Cite primary literature (PMID preferred) for all mechanistic and clinical claims
  • Prioritize recent reviews and landmark papers
  • Include direct quotes from abstracts where possible to support key statements
  • Distinguish evidence source types: human clinical, model organism, in vitro, computational

Output Format

Structure your response as a comprehensive narrative organized by the sections above. For each section, provide: - Factual content with specific details (numbers, percentages, gene names, variant nomenclature) - Ontology term suggestions (HPO, GO, CL, UBERON, CHEBI, MAXO, MONDO) where applicable - Evidence citations with PMIDs - Direct quotes from abstracts to support key claims - Clear indication when information is not available or not applicable for this disease

This report will be used to populate a disease knowledge base entry with: - Pathophysiology descriptions with causal chains - Gene/protein annotations (HGNC, GO terms) - Phenotype associations (HP terms) with frequencies - Cell type involvement (CL terms) - Anatomical locations (UBERON terms) - Chemical entities (CHEBI terms) - Treatment annotations (MAXO terms) - Evidence items with PMIDs and exact abstract quotes - Epidemiology, prognosis, diagnostic, and prevention information - Animal model descriptions with phenotype recapitulation details

Comprehensive Disease Characteristics Research Report: Mobitz Type I Atrioventricular Block (Wenckebach)

Executive summary

Mobitz type I atrioventricular (AV) block (Wenckebach) is a second-degree AV conduction pattern characterized by progressive PR prolongation followed by a non-conducted P wave, most commonly due to AV nodal (often vagally mediated) conduction delay. Contemporary guidance emphasizes (i) avoiding misdiagnosis with Mobitz II and pseudo–AV block, (ii) determining whether the block is nodal vs infranodal and whether symptoms temporally correlate, and (iii) reserving permanent pacing for persistent symptomatic cases or confirmed infranodal disease; asymptomatic vagally mediated/nodal Wenckebach should generally not be paced. (kusumoto20192018accahahrsguideline pages 48-49, kusumoto20192018accahahrsguideline pages 49-50, kusumoto20192018accahahrsguideline pages 45-48, canoy2024mobitztypeii pages 2-3, canoy2024mobitztypeii pages 3-5)

Key synthesis tables

The following tables summarize core definitions/guideline points and quantitative statistics.

Item Evidence summary Source (citation id) Publication year URL
Disease name and synonyms Mobitz type I atrioventricular block is also called Wenckebach second-degree AV block or Wenckebach periodicity. It is a second-degree AV block pattern characterized by cyclical PR prolongation followed by a non-conducted P wave. (morita2025longtermmanagementof pages 1-3, barold2018typeiwenckebach pages 2-3) (morita2025longtermmanagementof pages 1-3, barold2018typeiwenckebach pages 2-3) 2025; 2018 https://doi.org/10.1292/jvms.24-0521; https://doi.org/10.1002/clc.22874
Key diagnostic definition / ECG criteria ECG definition: repeated cycles of gradually lengthening PR intervals followed by a dropped QRS complex/non-conducted P wave. A shortening of the PR interval of the first conducted beat after the block supports Wenckebach. Vagal Wenckebach may show sinus slowing and can occasionally have an unchanged post-block PR, creating diagnostic confusion. (morita2025longtermmanagementof pages 1-3, canoy2024mobitztypeii pages 3-5, canoy2024mobitztypeii pages 2-3) (morita2025longtermmanagementof pages 1-3, canoy2024mobitztypeii pages 3-5, canoy2024mobitztypeii pages 2-3) 2025; 2024 https://doi.org/10.1292/jvms.24-0521; https://doi.org/10.3389/fcvm.2024.1450705
Typical anatomic level Mobitz I is usually an AV nodal block and is often vagally mediated; narrow-QRS Mobitz I is almost always AV nodal. Broad-QRS Mobitz I can still be nodal but is more often His–Purkinje/infranodal. In inferior STEMI, Wenckebach commonly reflects AV nodal ischemia because the AV nodal artery arises from the RCA in about 90% of patients. (kusumoto20192018accahahrsguideline pages 48-49, barold2018typeiwenckebach pages 2-3, karaman2026…clinicaldeterioration pages 110-115) (kusumoto20192018accahahrsguideline pages 48-49, barold2018typeiwenckebach pages 2-3, karaman2026…clinicaldeterioration pages 110-115) 2019; 2018; 2026 https://doi.org/10.1016/j.jacc.2018.10.044; https://doi.org/10.1002/clc.22874
Distinguishing features vs Mobitz II Differentiation matters because prognosis differs. Mobitz II requires a stable sinus rate and constant PR intervals before and after a blocked beat; correctly identified Mobitz II is typically His–Purkinje disease and generally indicates pacemaker therapy. In contrast, vagally mediated Wenckebach shows sinus slowing; ignoring sinus slowing can mislabel vagal Wenckebach as Mobitz II. A 2:1 AV block cannot be classified as type I or II from ECG alone. (kusumoto20192018accahahrsguideline pages 49-50, canoy2024mobitztypeii pages 2-3, canoy2024mobitztypeii pages 1-2) (kusumoto20192018accahahrsguideline pages 49-50, canoy2024mobitztypeii pages 2-3, canoy2024mobitztypeii pages 1-2) 2019; 2024 https://doi.org/10.1016/j.jacc.2018.10.044; https://doi.org/10.3389/fcvm.2024.1450705
Reversible causes / provoking factors Common reversible or provoking factors include increased vagal tone, inferior myocardial ischemia/infarction, and AV nodal–depressing drugs such as beta-blockers, non-dihydropyridine calcium-channel blockers, digoxin, and some antiarrhythmics. The guideline also lists reversible AV block causes such as Lyme carditis, electrolyte disturbances, drug toxicity, and obstructive sleep apnea. A 2024 pediatric case showed remifentanil exposure producing sinus bradycardia, Wenckebach-type block, then complete AV block, reversing after stopping the drug and giving atropine/adrenaline. (karaman2026…clinicaldeterioration pages 110-115, sfairopoulos2025clinicalsignificanceand pages 1-2, kusumoto20192018accahahrsguideline pages 48-49, ura2024repeatedcompleteatrioventricular pages 1-3, ura2024repeatedcompleteatrioventricular pages 3-5) (karaman2026…clinicaldeterioration pages 110-115, sfairopoulos2025clinicalsignificanceand pages 1-2, kusumoto20192018accahahrsguideline pages 48-49, ura2024repeatedcompleteatrioventricular pages 1-3, ura2024repeatedcompleteatrioventricular pages 3-5) 2026; 2025; 2019; 2024 https://doi.org/10.1111/jce.16697; https://doi.org/10.1016/j.jacc.2018.10.044; https://doi.org/10.1186/s12871-024-02593-8
Guideline points on pacing 2018 ACC/AHA/HRS: permanent pacing is symptom-driven for Mobitz I. Permanent pacing should not be performed in asymptomatic patients when the block is believed to be at the AV node, or when symptoms do not temporally correspond to the AV block (Class III: Harm). If symptomatic AV block due to a reversible cause does not resolve after treatment, permanent pacing is recommended; if acute reversible, nonrecurrent AV block fully resolves, permanent pacing should not be performed. Ambulatory ECG monitoring and exercise testing are reasonable to correlate symptoms and assess nodal vs infranodal block. (kusumoto20192018accahahrsguideline pages 48-49, kusumoto20192018accahahrsguideline pages 49-50, kusumoto20192018accahahrsguideline pages 45-48, salim2020mobitztypeii pages 5-6) (kusumoto20192018accahahrsguideline pages 48-49, kusumoto20192018accahahrsguideline pages 49-50, kusumoto20192018accahahrsguideline pages 45-48, salim2020mobitztypeii pages 5-6) 2019; 2020 https://doi.org/10.1016/j.jacc.2018.10.044; https://doi.org/10.30701/ijc.950
Acute management pearls AV nodal Wenckebach is often atropine-responsive. In inferior STEMI, Wenckebach is generally transient, often resolving within 3–7 days, with favorable prognosis; temporary/transvenous pacing is reserved for hemodynamically unstable patients or those not responding to medical therapy. Atropine is less useful for infranodal block and may worsen intra-His/distal disease. (karaman2026…clinicaldeterioration pages 110-115, kusumoto20192018accahahrsguideline pages 49-50) (karaman2026…clinicaldeterioration pages 110-115, kusumoto20192018accahahrsguideline pages 49-50) 2026; 2019 https://doi.org/10.1016/j.jacc.2018.10.044
Benign physiologic context In trained athletes, first-degree AV block and Mobitz I are considered normal/physiologic findings related to increased vagal tone and typically normalize with exercise; by contrast, Mobitz II and complete AV block are abnormal and warrant specialist assessment. (rakhmanov2024ecginathletes pages 5-8, rakhmanov2024ecginathletes pages 16-19, rakhmanov2024ecginathletes pages 1-5) (rakhmanov2024ecginathletes pages 5-8, rakhmanov2024ecginathletes pages 16-19, rakhmanov2024ecginathletes pages 1-5) 2024 https://doi.org/10.5772/intechopen.1004231

Table: This table summarizes the core definitional, diagnostic, anatomic, and guideline-management evidence for Mobitz type I (Wenckebach) AV block using only the cited context sources. It is useful as a compact reference for distinguishing benign AV nodal Wenckebach from higher-risk conduction disease and for capturing pacing/reversibility guidance.

Study (year) Population Outcome/statistic Numeric value(s) Notes URL Citation id
Kerola et al. (2019) Mini-Finland community cohort Cohort size and AV block events n=6,146; hospitalized with 2nd- or 3rd-degree AV block: 58 (0.9%) Population-based risk-factor study of incident AV block https://doi.org/10.1001/jamanetworkopen.2019.4176 (kerola2019riskfactorsassociated pages 1-2)
Kerola et al. (2019) Same cohort Risk per systolic blood pressure increase HR 1.22 per 10 mm Hg increase (95% CI 1.10-1.34; P=.005) Association remained significant after adjustment in sensitivity analyses https://doi.org/10.1001/jamanetworkopen.2019.4176 (kerola2019riskfactorsassociated pages 1-2, kerola2019riskfactorsassociated pages 4-5)
Kerola et al. (2019) Same cohort Risk per fasting glucose increase HR 1.22 per 20 mg/dL increase (95% CI 1.08-1.35; P=.001) Adjusted HR reported as 1.22 (95% CI 1.04-1.43; P=.01) after accounting for major adverse coronary events https://doi.org/10.1001/jamanetworkopen.2019.4176 (kerola2019riskfactorsassociated pages 1-2)
Kerola et al. (2019) Same cohort Population-attributable risk (PAR) SBP PAR 47% (95% CI 8%-67%); fasting glucose PAR 11% (95% CI 2%-21%) Suggests modifiable BP and glucose may explain a substantial fraction of AV block burden https://doi.org/10.1001/jamanetworkopen.2019.4176 (kerola2019riskfactorsassociated pages 1-2)
Kerola et al. (2019) Same cohort Third-degree AV block events and risks Third-degree AV block cases: 40; SBP HR 1.27 (95% CI 1.08-1.47; P=.002); fasting glucose HR 1.20 (95% CI 1.02-1.18; P=.02) Event subset from total AV block analyses https://doi.org/10.1001/jamanetworkopen.2019.4176 (kerola2019riskfactorsassociated pages 6-7)
Dideriksen et al. (2021) Danish patients <50 years with AV block of unknown aetiology treated with first pacemaker, plus matched controls Cohort size and follow-up Patients: 517; controls: 5,170; median age 41.3 years; median follow-up 9.8 years Young-onset AV block of unknown cause; not specific to Mobitz I but highly relevant to prognosis of AV block phenotypes requiring pacing https://doi.org/10.1093/eurheartj/ehab060 (sfairopoulos2025clinicalsignificanceand pages 4-4)
Dideriksen et al. (2021) Same cohort Primary composite outcome occurrence 14.9% in patients vs 3.2% in controls Composite: death, heart failure hospitalization, ventricular tachyarrhythmia, or resuscitated cardiac arrest https://doi.org/10.1093/eurheartj/ehab060 (sfairopoulos2025clinicalsignificanceand pages 4-4)
Dideriksen et al. (2021) Same cohort Relative risk of adverse outcome HR 3.8 (95% CI 2.9-5.1; P<0.001) AV block of unknown aetiology associated with 3- to 4-fold higher event rate vs controls https://doi.org/10.1093/eurheartj/ehab060 (sfairopoulos2025clinicalsignificanceand pages 4-4)
Dideriksen et al. (2021) Same cohort Higher-risk subgroup and early follow-up risk Persistent AV block HR 10.6 (95% CI 5.7-20.0; P<0.001); 0-5 year follow-up HR 6.8 (95% CI 4.6-10.0; P<0.001) Persistent block at diagnosis conveyed especially high risk https://doi.org/10.1093/eurheartj/ehab060 (sfairopoulos2025clinicalsignificanceand pages 4-4)
Andersen et al. (2013) 52,755 long-distance cross-country skiers Cohort size n=52,755 Endurance athlete cohort examining arrhythmia risk https://doi.org/10.1093/eurheartj/eht188 (andersen2013riskofarrhythmias pages 4-5)
Andersen et al. (2013) Same athlete cohort Bradyarrhythmia diagnosis counts Total bradyarrhythmias 122; second-degree AV block 31; complete AV block 34; sick sinus syndrome 49 Study notes Mobitz I/Wenckebach, sinus bradycardia, and first-degree AV block are usually considered normal findings in athletes https://doi.org/10.1093/eurheartj/eht188 (andersen2013riskofarrhythmias pages 4-5)
Andersen et al. (2013) Same athlete cohort Performance-category trend for bradyarrhythmias Hazard ratio per category 1.16 (95% CI 0.95-1.40) Non-significant trend across performance/finishing-time groups https://doi.org/10.1093/eurheartj/eht188 (andersen2013riskofarrhythmias pages 4-5)
MI-related Wenckebach excerpt (2026 source) Inferior STEMI / AV nodal ischemia context AV nodal artery origin from RCA ~90% Supports why Wenckebach in inferior MI is commonly AV nodal Not available in excerpt (karaman2026…clinicaldeterioration pages 110-115)
MI-related Wenckebach excerpt (2026 source) Inferior STEMI / AV nodal ischemia context Typical resolution time of Wenckebach Resolves within 3-7 days Transient, atropine-responsive, generally favorable prognosis in inferior MI Not available in excerpt (karaman2026…clinicaldeterioration pages 110-115)
MI-related Wenckebach excerpt (2026 source) Inferior STEMI / RV infarction context RV infarction complicating inferior STEMI 30%-50% Included as additional quantitative context in inferior MI with conduction disturbance Not available in excerpt (karaman2026…clinicaldeterioration pages 110-115)

Table: This table compiles key numeric findings from the available evidence relevant to Mobitz type I/Wenckebach and closely related AV block outcomes, including risk factors, prognosis, athlete data, and MI-associated transient Wenckebach. It is useful for quickly locating cohort sizes, hazard ratios, attributable risks, and clinically relevant time-course statistics.

1. Disease information

1.1 Overview / definition (current understanding)

Mobitz type I (Wenckebach) AV block is a second-degree AV block pattern in which the PR interval progressively lengthens over consecutive beats until a P wave fails to conduct (dropped QRS), often repeating in cycles (“grouped beating”). (morita2025longtermmanagementof pages 1-3)

A key discriminator in typical Wenckebach is that the first conducted beat after the dropped beat has a shorter PR interval than the preceding conducted PR interval(s). (canoy2024mobitztypeii pages 3-5)

Mobitz I is commonly AV nodal in origin and frequently associated with vagal surges (sinus slowing with concomitant AV nodal conduction depression). (kusumoto20192018accahahrsguideline pages 48-49, canoy2024mobitztypeii pages 2-3)

1.2 Key identifiers (ICD/MeSH/MONDO)

  • ICD-9 evidence in retrieved literature: ICD-9 code I44.1 was used to identify second-degree AV block hospitalizations in a population cohort study of incident AV block risk factors. (kerola2019riskfactorsassociated pages 2-4)
  • ICD-10 / ICD-11 / MeSH / MONDO: Not available from the retrieved full-text evidence in this run; therefore not asserted.

1.3 Synonyms / alternative names

  • Mobitz type I AV block
  • Wenckebach AV block
  • Wenckebach periodicity
  • Luciani–Wenckebach (used in sports cardiology guidance) (morita2025longtermmanagementof pages 1-3, zeppilli2024italiancardiologicalguidelines pages 7-8)

1.4 Evidence sources in this report

This entry is derived from aggregated disease-level resources (ACC/AHA/HRS guideline; reviews) plus case reports illustrating reversible causes and management decisions. (kusumoto20192018accahahrsguideline pages 48-49, ura2024repeatedcompleteatrioventricular pages 1-3, ura2024repeatedcompleteatrioventricular pages 3-5)

2. Etiology

2.1 Disease causal factors (common causes / contexts)

Mobitz I is most often AV nodal and frequently reflects vagal hypertonicity (physiologic in sleep and in trained athletes) or transient AV nodal depression. (kusumoto20192018accahahrsguideline pages 48-49, rakhmanov2024ecginathletes pages 5-8, zeppilli2024italiancardiologicalguidelines pages 8-10)

Other clinically important causes/contexts include: * Inferior myocardial infarction / AV nodal ischemia: Wenckebach in inferior STEMI is commonly AV nodal because the AV nodal artery arises from the RCA in ~90% of patients; it is typically transient and “resolving within 3–7 days.” (karaman2026…clinicaldeterioration pages 110-115) * Drug/toxin-related AV nodal depression: beta-blockers, non-dihydropyridine calcium channel blockers, digoxin, and antiarrhythmics are commonly implicated reversible contributors to AV block. (sfairopoulos2025clinicalsignificanceand pages 1-2, kusumoto20192018accahahrsguideline pages 48-49) * Other reversible causes noted in guideline: metabolic derangements (e.g., hyperkalemia), infections (e.g., Lyme), obstructive sleep apnea, and drug toxicity/overdose. (kusumoto20192018accahahrsguideline pages 48-49)

2.2 Risk factors (population-level)

In a community-based cohort (Mini-Finland), elevated systolic blood pressure and fasting glucose were associated with hospitalization for second- or third-degree AV block (not subtype-specific to Mobitz I, but relevant to conduction disease burden). (kerola2019riskfactorsassociated pages 1-2)

Key quantitative results (see artifact-01): * n=6,146; AV block events=58 (0.9%). (kerola2019riskfactorsassociated pages 1-2) * HR 1.22 per 10 mmHg systolic BP increase; HR 1.22 per 20 mg/dL fasting glucose increase; population-attributable risk (PAR) estimates: 47% (BP) and 11% (fasting glucose). (kerola2019riskfactorsassociated pages 1-2)

2.3 Protective factors

Direct protective factors specific to Mobitz I were not identified in the retrieved evidence. A practical “protective” clinical feature is normalization with exercise (suggesting physiologic/vagal nodal delay rather than fixed infranodal disease), which is used in athlete eligibility evaluations. (zeppilli2024italiancardiologicalguidelines pages 7-8, zeppilli2024italiancardiologicalguidelines pages 8-10)

2.4 Gene–environment interactions

The retrieved evidence supports interaction between genetic predisposition to conduction disease (ion-channel/gap-junction/nuclear envelope genes) and acquired modifiers such as inflammation, autoimmunity, or autonomic tone, but specific gene–environment interaction studies for Mobitz I were not available in the retrieved texts. (li2024cardiacconductiondiseases pages 9-11, li2024cardiacconductiondiseases pages 23-28)

3. Phenotypes

3.1 Core clinical phenotypes

Mobitz I may be asymptomatic or manifest with: * Dizziness/lightheadedness * Presyncope/syncope * Exertional chest pain or shortness of breath (when conduction worsens or rate response inadequate) (kusumoto20192018accahahrsguideline pages 45-48, kusumoto20192018accahahrsguideline pages 48-49)

In vagally mediated cases, episodes often occur during sleep or reflex neural surges and may show sinus slowing with onset of AV block. (kusumoto20192018accahahrsguideline pages 48-49, canoy2024mobitztypeii pages 2-3)

3.2 Phenotype characteristics (onset, severity, progression)

  • Onset: can be incidental and intermittent; may be nocturnal (athletes) or triggered by acute illness/drugs. (kusumoto20192018accahahrsguideline pages 48-49, zeppilli2024italiancardiologicalguidelines pages 8-10)
  • Severity: typically benign when nodal/vagal; can be clinically significant if infranodal or associated with prolonged pauses/syncope. (kusumoto20192018accahahrsguideline pages 45-48, salim2020mobitztypeii pages 5-6)
  • Progression: nodal Wenckebach “is typically benign and does not commonly progress suddenly to complete heart block.” (kusumoto20192018accahahrsguideline pages 45-48)

3.3 Suggested HPO terms (examples)

(ontology suggestions; not exhaustively validated in retrieved sources) * Second-degree atrioventricular block (HP term suggestion) * Bradycardia (HP term suggestion) * Syncope (HP term suggestion) * Presyncope/dizziness (HP term suggestion) * Exercise intolerance / dyspnea on exertion (HP term suggestion)

3.4 Quality-of-life impact

The guideline emphasizes that pacemaker therapy (when used) is generally reserved for “significant symptoms that affect quality of life,” indicating symptom burden drives intervention decisions. (kusumoto20192018accahahrsguideline pages 45-48)

4. Genetic / molecular information

4.1 Causal genes and molecular contributors (evidence-based candidates)

Mobitz I itself is often functional/vagal; however, Wenckebach-like AV nodal conduction phenotypes can appear within broader cardiac conduction system disease. A 2024 mechanistic review enumerates genes and molecular classes implicated in AV nodal conduction disease and AV block, including: * Ion channels: SCN5A, SCN1B, CACNA1C, CACNA1G, KCNH2, KCNJ2, KCNQ1, HCN4, TRPM4. (li2024cardiacconductiondiseases pages 8-9) * Gap junction / connexins: multiple connexin genes are implicated (e.g., GJA5/Cx40, GJC1/Cx45), and scaffolding interactions (ZO-1) regulate connexin and Nav1.5 localization. (li2024cardiacconductiondiseases pages 9-11, li2024cardiacconductiondiseases pages 19-20) * Nuclear envelope / structural: lamin A/C (LMNA) and EMD are linked to conduction disease phenotypes including AV block. (li2024cardiacconductiondiseases pages 19-20, li2024cardiacconductiondiseases pages 30-32)

4.2 Mechanistic examples linking to Wenckebach phenotype

  • Inflammatory cytokine mechanism: TNF-α overexpression was associated with “prolonged PR interval, AVN Wenckebach, and extended effective and functional refractory periods,” supporting inflammation-driven AV nodal refractoriness changes as a mechanistic route to Wenckebach. (li2024cardiacconductiondiseases pages 9-11)
  • Autonomic (vagal) mechanism: A vagal surge can produce simultaneous sinus slowing and AV nodal conduction depression, generating vagally mediated Wenckebach patterns. (canoy2024mobitztypeii pages 2-3)

4.3 Variant-level, allele frequency, and ClinVar/gnomAD information

Specific pathogenic variants, ACMG classifications, and population allele frequencies were not present in retrieved evidence; thus not asserted.

4.4 Suggested GO biological process / cellular component terms (examples)

  • Cardiac conduction (GO term suggestion)
  • Regulation of heart rate by autonomic nervous system (GO term suggestion)
  • Cell–cell junction organization / gap junction assembly (GO term suggestion)
  • Inflammatory response / cytokine-mediated signaling (GO term suggestion)

4.5 Suggested Cell Ontology (CL) terms (examples)

  • Cardiac muscle cell / cardiomyocyte (CL term suggestion)
  • Atrioventricular node cell / conduction system cell (CL term suggestion)
  • Macrophage (re: macrophage–connexin conduction concept discussed in conduction disease review) (li2024cardiacconductiondiseases pages 9-11)

5. Environmental information

Key non-genetic contributors are largely clinical/iatrogenic and physiologic: * High vagal tone (sleep, athletic training). (rakhmanov2024ecginathletes pages 5-8, zeppilli2024italiancardiologicalguidelines pages 8-10) * Medication exposures that depress AV nodal conduction (beta-blockers, non-DHP CCBs, digoxin, antiarrhythmics). (sfairopoulos2025clinicalsignificanceand pages 1-2, kusumoto20192018accahahrsguideline pages 48-49) * Anesthesia/opioid exposure example: Remifentanil can trigger bradycardia progressing through Wenckebach-type block to complete AV block, reversing with drug cessation and atropine/adrenaline. (ura2024repeatedcompleteatrioventricular pages 1-3, ura2024repeatedcompleteatrioventricular pages 3-5)

6. Mechanism / pathophysiology

6.1 Causal chain (nodal/vagal Wenckebach – typical)

Trigger (vagal surge during sleep/training; vagomimetic drugs; autonomic reflex) → AV nodal refractoriness increases / conduction slows (often with sinus slowing) → progressive PR prolongation → non-conducted P wave (dropped QRS) → symptoms may occur if ventricular pauses reduce cerebral perfusion (presyncope/syncope). (canoy2024mobitztypeii pages 2-3, kusumoto20192018accahahrsguideline pages 48-49)

6.2 Ischemic Wenckebach (inferior MI context)

Inferior MI (often RCA) → AV nodal ischemia (AV nodal artery RCA origin ~90%) → AV nodal Wenckebach with narrow-QRS escape → typically transient (3–7 days) and atropine responsive; pacing reserved for instability. (karaman2026…clinicaldeterioration pages 110-115)

6.3 Distinguishing pathophysiology: nodal vs infranodal Wenckebach

Although Wenckebach is usually nodal, it can be infranodal in a subset, particularly with wide QRS or in the presence of His–Purkinje disease; infranodal disease has different prognosis and may prompt pacing even without symptoms. (kusumoto20192018accahahrsguideline pages 45-48, barold2018typeiwenckebach pages 2-3)

6.4 Differential mechanisms / pseudo–AV block

Pseudo–AV block can arise from concealed extrasystoles (junctional/His–Purkinje), non-conducted atrial premature beats, or interpolated PVCs with concealed retrograde conduction, creating patterns that mimic Wenckebach or Mobitz II. (canoy2024mobitztypeii pages 3-5, canoy2024mobitztypeii pages 5-7)

7. Anatomical structures affected

7.1 Organ/system level

  • Primary system: cardiovascular system—cardiac conduction system. (kusumoto20192018accahahrsguideline pages 48-49, li2024cardiacconductiondiseases pages 8-9)

7.2 Key structures (UBERON suggestions)

  • Heart (UBERON term suggestion)
  • Atrioventricular node (UBERON term suggestion)
  • His bundle / His–Purkinje system (UBERON term suggestion)

7.3 Subcellular/structural correlates

Conduction disease mechanisms emphasize membrane ion channels (Na+, Ca2+), gap junctions/connexins, and scaffolding proteins regulating channel localization. (li2024cardiacconductiondiseases pages 9-11, li2024cardiacconductiondiseases pages 19-20)

8. Temporal development

8.1 Onset

Mobitz I may present intermittently, often during sleep or in specific physiological states (athletes), or acutely after exposures (e.g., drug effect) or ischemia (inferior MI). (ura2024repeatedcompleteatrioventricular pages 1-3, ura2024repeatedcompleteatrioventricular pages 3-5, zeppilli2024italiancardiologicalguidelines pages 8-10)

8.2 Progression and course

  • Nodal/vagal Mobitz I is generally benign and not commonly progressing suddenly to complete heart block. (kusumoto20192018accahahrsguideline pages 45-48)
  • In inferior MI, Wenckebach is often transient (3–7 days). (karaman2026…clinicaldeterioration pages 110-115)

9. Inheritance and population

9.1 Epidemiology

Mobitz I–specific population prevalence was not identified in the retrieved evidence. However, AV block hospitalizations (second/third degree) were 0.9% over long follow-up in a 6,146-person community cohort. (kerola2019riskfactorsassociated pages 1-2)

9.2 Athlete populations

Sports cardiology guidance characterizes Mobitz I (Luciani–Wenckebach) as common in highly trained athletes (often nocturnal) and compatible with eligibility when it normalizes with increased heart rate and there is no structural heart disease or concerning pauses. (zeppilli2024italiancardiologicalguidelines pages 7-8, zeppilli2024italiancardiologicalguidelines pages 8-10)

10. Diagnostics

10.1 Core diagnostic test: ECG

Diagnostic criterion: progressive PR lengthening with a dropped beat in repeated cycles. (morita2025longtermmanagementof pages 1-3)

10.2 Diagnostic strategy in practice (ACC/AHA/HRS)

Because symptoms may be intermittent, the guideline recommends establishing symptom–rhythm correlation, often requiring longer-term monitoring: * Ambulatory ECG monitoring: 30–90 day event monitors or implanted devices have greater yield than 24–48h monitoring. (kusumoto20192018accahahrsguideline pages 49-50) * Exercise treadmill testing: reasonable in exertional symptoms to assess benefit from pacing and to help localize nodal vs infranodal block (nodal improves with exercise; infranodal typically does not). (kusumoto20192018accahahrsguideline pages 49-50, kusumoto20192018accahahrsguideline pages 45-48) * EPS (His recordings): may be used to localize block and evaluate mimics (His extrasystoles). (kusumoto20192018accahahrsguideline pages 49-50)

10.3 Differential diagnosis considerations (misinterpretation risks)

  • Do not classify 2:1 AV block as Mobitz I or II by ECG alone (classification may require further evaluation). (canoy2024mobitztypeii pages 1-2)
  • Vagal Wenckebach may mimic Mobitz II when PR intervals appear constant; sinus slowing (P–P lengthening) is a critical clue and argues against true Mobitz II. (canoy2024mobitztypeii pages 2-3, canoy2024mobitztypeii pages 5-7)
  • Pseudo–AV block due to concealed extrasystoles or poor P-wave visibility can mislead and may require EPS to prevent unnecessary pacing. (canoy2024mobitztypeii pages 5-7)

11. Outcome / prognosis

11.1 Prognosis of nodal/vagal Wenckebach

Guideline perspective: Mobitz I (especially nodal) is typically benign; pacing is symptom-driven, and asymptomatic nodal/vagal AV block should not be paced (Class III: Harm). (kusumoto20192018accahahrsguideline pages 45-48, kusumoto20192018accahahrsguideline pages 48-49)

11.2 Contextual prognosis: MI-related Wenckebach

In inferior MI, Wenckebach is generally transient with favorable prognosis and typically resolves within 3–7 days. (karaman2026…clinicaldeterioration pages 110-115)

11.3 Broader AV block outcomes (not Mobitz I–specific)

Young patients (<50) requiring pacing for AV block of unknown aetiology had higher long-term adverse outcomes than matched controls (composite endpoint 14.9% vs 3.2%; HR 3.8) over median 9.8 years, emphasizing that some conduction disease presentations in younger patients are not benign. (sfairopoulos2025clinicalsignificanceand pages 4-4)

12. Treatment

12.1 General management principles (ACC/AHA/HRS 2018 guideline; published 2019)

  • Symptom correlation is central: pacemaker need is “symptom driven.” (kusumoto20192018accahahrsguideline pages 49-50)
  • Avoid unnecessary pacing: permanent pacing should not be performed in asymptomatic patients when block is believed nodal, and should not be performed when symptoms do not temporally correspond (Class III: Harm). (kusumoto20192018accahahrsguideline pages 45-48)
  • Reversible causes: if symptomatic AV block is due to a reversible cause and does not resolve after treatment, permanent pacing is recommended (Class I); if acute AV block from a reversible, nonrecurrent cause resolves completely, permanent pacing should not be performed (Class III: Harm). (kusumoto20192018accahahrsguideline pages 48-49)

12.2 Acute/urgent management (real-world implementation)

In AV nodal Wenckebach with hemodynamic compromise: * Atropine is first-line for AV nodal block; infranodal block responds poorly and may worsen with atropine. (karaman2026…clinicaldeterioration pages 110-115, kusumoto20192018accahahrsguideline pages 49-50) * Pacing (temporary/transvenous or transcutaneous) is reserved for unstable patients unresponsive to medication. (karaman2026…clinicaldeterioration pages 110-115)

12.3 Athlete-specific implementation

Italian COCIS 2024 guidance: Mobitz I is generally compatible with competitive sport if it normalizes with increased heart rate (exercise testing/monitoring) and there are no symptoms or structural heart disease; nocturnal advanced AV block due to vagal hypertonicity may be compatible if it disappears after detraining and does not include pauses >3 seconds. (zeppilli2024italiancardiologicalguidelines pages 7-8, zeppilli2024italiancardiologicalguidelines pages 8-10)

12.4 Emerging/advanced therapeutic approaches: cardioneuroablation (CNA)

A 2024 Frontiers review describes CNA as a strategy for recurrent vasovagal syncope and vagally mediated advanced AV block/Wenckebach in young patients by ablating cardiac parasympathetic ganglionated plexi near the SA and AV nodes. It highlights limited evidence, lack of guideline consensus, variable techniques, and the goal of avoiding pacemakers in selected young patients. (francia2024cardioneuroablationtheknown pages 1-2, francia2024cardioneuroablationtheknown pages 2-4)

12.5 MAXO term suggestions (examples)

  • Permanent cardiac pacing / pacemaker implantation (MAXO suggestion)
  • Temporary cardiac pacing (MAXO suggestion)
  • Ambulatory electrocardiographic monitoring (MAXO suggestion)
  • Exercise stress testing (MAXO suggestion)
  • Atropine administration (MAXO suggestion)
  • Cardioneuroablation / ganglionated plexus ablation (MAXO suggestion)

13. Prevention

Primary prevention specific to Mobitz I is not well-defined in the retrieved evidence, but population-level prevention of clinically relevant AV block may be supported by controlling modifiable cardiometabolic risks (blood pressure and glucose), which were associated with incident AV block and accounted for large PAR estimates in a community cohort. (kerola2019riskfactorsassociated pages 1-2)

Secondary prevention includes recognition of physiologic (vagal/athletic) vs pathologic patterns using exercise testing and monitoring to avoid misclassification and unnecessary device therapy. (kusumoto20192018accahahrsguideline pages 49-50, zeppilli2024italiancardiologicalguidelines pages 7-8)

14. Other species / natural disease

A naturally occurring Wenckebach/paroxysmal AV block phenotype has been reported in a dog (Shiba Inu) with syncope and Holter-documented Wenckebach cycles; atropine response and absence of conduction-system histopathology suggested vagal mediation. The dog had durable clinical benefit from epicardial pacemaker implantation with long-term survival (13 years 3 months post-implant). (morita2025longtermmanagementof pages 1-3, morita2025longtermmanagementof pages 3-4)

15. Model organisms

No dedicated engineered model organism studies for Mobitz I were retrieved in this run. However, the 2024 conduction-disease review includes animal-model annotations in gene tables (e.g., mouse phenotypes “AVB” for connexin-related genes), indicating that murine genetic models are commonly used to study AV block mechanisms broadly. (li2024cardiacconductiondiseases pages 30-32)

Expert opinions / analysis (authoritative sources)

  1. ACC/AHA/HRS guideline stance: Mobitz I is typically benign and management is symptom-driven; avoid permanent pacing in asymptomatic nodal/vagal block and when symptoms do not correlate (Class III: Harm). (kusumoto20192018accahahrsguideline pages 45-48, kusumoto20192018accahahrsguideline pages 48-49)
  2. Diagnostic caution (Frontiers 2024): Misdiagnosis between Wenckebach/vagal AV block and Mobitz II is common; careful attention to sinus slowing and PR behavior, plus prolonged monitoring and EPS in atypical cases, is essential to avoid unnecessary pacemakers. (canoy2024mobitztypeii pages 2-3, canoy2024mobitztypeii pages 5-7)
  3. Sports cardiology perspective (COCIS 2024): Mobitz I that normalizes with increased heart rate is generally compatible with competitive sport, reinforcing physiologic vagal Wenckebach as a normal variant in trained athletes. (zeppilli2024italiancardiologicalguidelines pages 7-8)

Notes on evidence gaps in this run

  • MONDO, MeSH, ICD-10/ICD-11 identifiers were not present in retrieved evidence; they should be added from ontology databases (MONDO, MeSH, ICD).
  • Mobitz I–specific prevalence/incidence and large modern cohorts focused exclusively on Wenckebach were not retrieved; most quantitative data available here pertain to AV block broadly. (kerola2019riskfactorsassociated pages 1-2)

References

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