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Congenitally complete heart block. Developmental aspects

R H Anderson, A C Wenick, T G Losekoot

    Circulation
    |July 1, 1977
    PubMed

    Insights

    Congenital complete heart block arises from disruptions in the atrioventricular conduction system, with distinct types linked to embryonic development of the heart

    Area of Science:

    • Cardiovascular Embryology
    • Congenital Heart Disease
    • Cardiac Electrophysiology

    Background:

    • Congenital complete heart block (CCHB) presents a spectrum of atrioventricular conduction defects.
    • Understanding the developmental origins of CCHB is crucial for accurate classification and management.

    Observation:

    • Three cases of CCHB were analyzed, fitting Lev's categorization.
    • Observed defects included lack of atrial-conducting tissue communication and discontinuity of the atrioventricular bundle.

    Findings:

    • Embryonic development suggests the anulus fibrosus originates from atrioventricular junctional sulcus tissue.
    • Endocardial cushions play a minimal role in atrial-ventricular separation during development.

    Implications:

    • This developmental model explains the varied presentations of CCHB.
    • It also provides insight into the persistence of Mahaim fibers (nodo-ventricular and nodo-fascicular fibers).

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