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Anatomical configuration of the His bundle and bundle branches in the human heart

G K Massing, T N James

    Circulation
    |April 1, 1976
    PubMed

    Insights

    Detailed human heart anatomy reveals the His bundle and its branching patterns. The left bundle branch (LBB) origin is narrow and variable, while the right bundle branch (RBB) often forms an obtuse angle with the His bundle.

    Area of Science:

    • Cardiovascular Anatomy
    • Cardiac Electrophysiology

    Background:

    • Understanding the His bundle and its branching is crucial for cardiac function.
    • Variations in the anatomy of the His-Purkinje system can impact electrophysiological studies and clinical outcomes.

    Purpose of the Study:

    • To histologically examine the relationships between the His bundle, bundle branch origins, and the interventricular septum.
    • To delineate the entire bundle branch systems and describe their anatomical variations.

    Main Methods:

    • Histological examination of 32 human hearts.
    • Delineation of the complete bundle branch systems in 13 hearts.

    Main Results:

    • The His bundle traversed the right interventricular septal crest in 5 hearts.
    • The left bundle branch (LBB) originated as a narrow stem, crossing from right to left through the membranous septum's inferior margin.
    • Proximal LBB anatomy was highly variable, with multiple interconnected fiber groups.
    • The right bundle branch (RBB) formed an obtuse angle with the His bundle in most cases (27/32).

    Conclusions:

    • Anatomical variations in the His bundle and bundle branch origins have significant clinical, electrophysiologic, and electrocardiographic implications.
    • The complex and variable nature of the LBB requires careful consideration in cardiac procedures.

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