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Origin of the sinoatrial node and atrioventricular node arteries in right, mixed, and left inferior emphasis systems

W V Vieweg, J S Alpert, A D Hagan

    Catheterization and Cardiovascular Diagnosis
    |January 1, 1975
    PubMed

    Insights

    The origin of the sinoatrial (SAN) and atrioventricular (AVN) node arteries varies, with most SAN arteries originating from the right coronary artery and most AVN arteries also arising from the right coronary artery.

    Area of Science:

    • Cardiovascular Anatomy
    • Coronary Artery Anatomy
    • Cardiac Electrophysiology

    Background:

    • The anatomical origins of the sinoatrial node artery (SAN) and atrioventricular node artery (AVN) are crucial for understanding cardiac electrical conduction and potential ischemia.
    • Variations in coronary artery anatomy can influence blood supply to the nodes, impacting cardiac function.

    Purpose of the Study:

    • To determine the precise origins of the SAN and AVN arteries in a cohort of patients with normal coronary arteriograms.
    • To analyze the relationship between the SAN and AVN artery origins and different inferior emphasis systems of the coronary arteries.

    Main Methods:

    • Analysis of coronary arteriograms from 118 patients with normal coronary artery anatomy.
    • Classification of arteriograms into right, mixed, and left inferior emphasis systems.
    • Detailed mapping of the origin of the SAN and AVN arteries in relation to the coronary artery system.

    Main Results:

    • The SAN artery originated from the right coronary artery (53%), left coronary artery (35%), or had a dual origin (11%).
    • The AVN artery originated from the right coronary artery (84%), left coronary artery (8%), or both (8%).
    • Specific origins of SAN and AVN arteries showed variations based on the dominant inferior emphasis system (right, mixed, or left).

    Conclusions:

    • Significant variability exists in the coronary artery origins of the SAN and AVN arteries.
    • Understanding these variations is essential for interpreting cardiac imaging and for potential interventions related to the cardiac conduction system.

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