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Chronic bifascicular block: evaluation of familial factors

B R Greenspahn, P Denes, W Daniel

    Annals of Internal Medicine
    |May 1, 1976
    PubMed

    Insights

    Familial factors play a role in chronic bifascicular block. Relatives of affected individuals show a higher frequency of conduction defects, suggesting an inherited tendency for this cardiac condition.

    Area of Science:

    • Cardiology
    • Genetics
    • Clinical Medicine

    Background:

    • Chronic bifascicular block is a cardiac condition affecting electrical conduction.
    • Understanding the role of genetics and family history is crucial for risk assessment.

    Purpose of the Study:

    • To investigate the significance of familial factors in the development of chronic bifascicular block.
    • To determine if relatives of patients with chronic bifascicular block have a higher prevalence of conduction defects.

    Main Methods:

    • Examined 134 first- and second-degree relatives of 44 chronic bifascicular block outpatients.
    • Compared conduction defects in the study group with a race-, age-, and sex-matched control group.
    • Analyzed conduction defect frequency across different age groups within the study cohort.

    Main Results:

    • The study group exhibited a significantly higher frequency of conduction defects compared to the control group (24/95 vs. 10/95, P < 0.02).
    • Relatives under 18 showed similar conduction defect rates to literature values.
    • A high frequency of conduction defects (5/7) was observed in study group members over 65 years old.

    Conclusions:

    • Findings suggest a familial predisposition to conduction disease in chronic bifascicular block.
    • An age-related familial tendency for conduction disease is indicated.
    • Familial screening may be valuable for individuals with chronic bifascicular block.

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