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Ionic current and pacemaker activity of the S-A node cells.

K Yanagihara

    Japanese Circulation Journal
    |July 1, 1980
    PubMed
    Summary
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    Researchers identified five key membrane currents (if, is, ik, ih, il) in rabbit sinoatrial node cells. The study details the ionic basis of these currents and reconstructs the cell

    Area of Science:

    • Cardiovascular Physiology
    • Electrophysiology
    • Cell Biology

    Background:

    • The sinoatrial (SA) node is the primary pacemaker of the heart.
    • Understanding the ionic mechanisms underlying SA node activity is crucial for explaining cardiac rhythm generation.

    Purpose of the Study:

    • To identify and characterize the major membrane currents in rabbit SA node cells.
    • To model these currents using Hodgkin-Huxley type equations.
    • To reconstruct the action potential and pacemaker activity of the SA node.

    Main Methods:

    • Voltage clamp technique was employed to observe five membrane currents: if, is, ik, ih, and il.
    • Ionic basis of each current was investigated.
    • Hodgkin-Huxley type equations were used for current analysis.

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    Main Results:

    • Outward current (ik) is carried by potassium ions (K+).
    • Inward current (is) is primarily carried by sodium ions (Na+) with a contribution from calcium ions (Ca2+).
    • Hyperpolarization-activated inward current (ih) is a mixed system involving Na+ and chloride ions (Cl-).
    • Phase 4 diastolic depolarization is dominated by 'is', with significant assistance from 'ik'.

    Conclusions:

    • The study successfully identified and characterized key ionic currents in rabbit SA node cells.
    • The reconstructed action potential and pacemaker activity highlight the roles of 'is' and 'ik' in diastolic depolarization.
    • This provides a quantitative model for SA node electrophysiology.