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Related Experiment Videos

Sinus slowing and pacemaker shift caused by adenosine in rabbit SA node.

G A West, L Belardinelli

    Pflugers Archiv : European Journal of Physiology
    |January 1, 1985
    PubMed
    Summary
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    Adenosine slows heart rate and alters atrial activation patterns in rabbits. This study reveals adenosine

    Area of Science:

    • Cardiovascular Physiology
    • Pharmacology

    Background:

    • Adenosine is known to exert negative chronotropic effects across various species.
    • Understanding adenosine's precise mechanisms on cardiac electrical activity is crucial for cardiovascular research.

    Purpose of the Study:

    • To further characterize the electrophysiological effects of adenosine on cardiac function.
    • To investigate adenosine's impact on pacemaker activity and atrial activation patterns in isolated rabbit hearts and SA node tissue.

    Main Methods:

    • Utilized isolated perfused rabbit hearts and isolated SA node preparations for electrophysiological recordings.
    • Administered adenosine and 2-chloroadenosine to determine dose-dependent effects on heart rate and activation sequences.
    • Employed microelectrode recordings to precisely map electrical activation sites.

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    Main Results:

    • Adenosine (1 X 10(-5) M) and 2-chloroadenosine (1 X 10(-7) M) demonstrated dose-dependent negative chronotropic effects.
    • Adenosine induced a shift in the earliest site of atrial activation from the SA node to the crista terminalis (CT).
    • Observed reversible conduction block within the sinus node during adenosine infusion, without affecting CT conduction or action potentials.

    Conclusions:

    • Adenosine significantly alters cardiac electrophysiology, including heart rate regulation and pacemaker site.
    • The observed pacemaker shift and conduction block highlight adenosine's complex role in modulating cardiac rhythm.
    • Findings provide detailed insights into adenosine's pharmacological actions on the sinoatrial node and atria.