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Related Experiment Videos

Effect of apomorphine on the canine SA node.

S Chiba, H Ono, K Iwatsuki

    Japanese Heart Journal
    |March 1, 1975
    PubMed
    Summary

    Apomorphine directly depresses the sinoatrial (SA) node, causing slower heart rates. High doses may cause a temporary acceleration via a reflex mechanism, not blocked by propranolol.

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    Area of Science:

    • Pharmacology
    • Cardiovascular Physiology

    Background:

    • The sinoatrial (SA) node is the primary pacemaker of the heart.
    • Understanding the effects of drugs on cardiac rhythm is crucial for cardiovascular health.

    Purpose of the Study:

    • To investigate the chronotropic effects of apomorphine on the SA node.
    • To elucidate the mechanisms underlying apomorphine-induced cardiac rhythm changes.

    Main Methods:

    • Constant pressure perfusion of the sinus node artery in 10 in situ and 3 isolated SA node preparations.
    • Selective administration of apomorphine at varying doses.
    • Assessment of chronotropic effects and blockade with atropine and propranolol.

    Main Results:

    • Apomorphine caused a dose-dependent negative chronotropic effect, not blocked by atropine.
    • Higher doses induced sinus irregularity, atrioventricular nodal rhythm, or sinus arrest.
    • A transient, slight sinus acceleration was observed at higher doses in situ, accompanied by a blood pressure fall, and inhibited by propranolol.

    Conclusions:

    • Apomorphine exerts a direct depressive action on the SA node.
    • High-dose apomorphine can induce a reflex-mediated sinus acceleration.
    • These findings contribute to understanding the complex cardiovascular effects of apomorphine.

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