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Passive electrical properties of the atrio-ventricular node.

W C De Mello

    Pflugers Archiv : European Journal of Physiology
    |October 19, 1977
    PubMed
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    The atrioventricular node has high intracellular resistance, slowing cardiac impulse conduction. Acetylcholine further reduces conduction speed in the atrioventricular node.

    Area of Science:

    • Cardiovascular Physiology
    • Cardiac Electrophysiology

    Background:

    • The atrioventricular node (AVN) plays a critical role in regulating heart rhythm by delaying electrical impulse transmission from the atria to the ventricles.
    • Understanding the passive electrical properties of the AVN is essential for elucidating the mechanisms of impulse conduction delay.

    Purpose of the Study:

    • To determine the passive electrical properties of the rabbit heart's atrioventricular node and atrial muscle.
    • To investigate the influence of acetylcholine on these electrical properties.

    Main Methods:

    • Utilized a suction electrode technique to polarize cardiac cells.
    • Measured space constant, intracellular resistance (ra), input resistance, and time constant (tau) in AVN and atrial tissues.
    • Assessed the effects of acetylcholine on AVN electrical properties.

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    Main Results:

    • The AVN exhibited a significantly smaller space constant (430 µm) compared to other cardiac fibers.
    • Nodal cells demonstrated higher intracellular resistance (ra ≈ 40.9 MΩ·cm) and input resistance (N layer ≈ 880 KΩ) than atrial muscle.
    • Acetylcholine reduced the AVN's space constant by 38% and time constant by 33%.

    Conclusions:

    • High intracellular resistance in AVN cells is a primary factor contributing to the delay in cardiac impulse conduction.
    • Acetylcholine modulates AVN electrical properties, potentially influencing heart rate and rhythm regulation.