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Hereditary progressive atrioventricular conduction defect.

H T Lynch, S Mohiuddin, J Moran

    The American Journal of Cardiology
    |September 1, 1975
    PubMed
    Summary
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    Genetic analysis of Family S suggests a hereditary progressive atrioventricular (A-V) conduction defect may be inherited via an autosomal dominant factor. Further study is needed to explain the regression of heart block in some relatives.

    Area of Science:

    • Genetics
    • Cardiology
    • Medical Research

    Background:

    • Family S exhibits a hereditary progressive atrioventricular (A-V) conduction defect.
    • Previous studies on hereditary heart conditions provide context.

    Purpose of the Study:

    • To investigate the genetic transmission of progressive atrioventricular (A-V) conduction defects in Family S.
    • To establish a working hypothesis for the inheritance pattern.

    Main Methods:

    • Compilation of extensive pedigree data.
    • Analysis of natural history aspects within the family.
    • Concordance analysis of heart block in parents and offspring.

    Main Results:

    • Data suggest a Mendelian autosomal dominant factor may transmit the diathesis for the defect.

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  • Observed regression of the defect, including reversion from first-degree heart block to normal A-V conduction, was noted.
  • An unusually large and cooperative kindred (1,067 members) was established.

    • Conclusions:

    • A Mendelian autosomal dominant inheritance pattern is hypothesized for this A-V conduction defect.
    • The regression of heart block requires further investigation.
    • Longitudinal evaluation of the kindred is planned to understand these findings.