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Postpacing tachycardia: autonomic involvement.

J M Loeb, J M deTarnowsky, M R Warner

    The American Journal of Physiology
    |August 1, 1987
    PubMed
    Summary
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    Postpacing tachycardia (PPT) is a transient heart rate increase after sinus node pacing. Autonomic nervous system involvement, particularly acetylcholine and catecholamines, significantly influences PPT magnitude and timing.

    Area of Science:

    • Cardiovascular Physiology
    • Autonomic Nervous System Regulation
    • Cardiac Electrophysiology

    Background:

    • Transient sinus tachycardia, or postpacing tachycardia (PPT), follows cessation of pacing from the sinus node region.
    • The precise autonomic mechanisms underlying PPT remain incompletely characterized.

    Purpose of the Study:

    • To elucidate the role of autonomic nervous system components in the development and characteristics of postpacing tachycardia.
    • To investigate the influence of acetylcholine and catecholamines on PPT.

    Main Methods:

    • Utilized alpha-chloralose-anesthetized dogs with surgically transected vagi and stellate ganglia.
    • Recorded electrocardiograms, blood pressure, and cardiac electrograms.
    • Administered atropine and propranolol to assess autonomic blockade effects on PPT.

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    Main Results:

    • PPT magnitude and timing were predominantly dependent on pacing duration rather than heart rate level.
    • Atropine administration significantly increased PPT magnitude and shortened its onset, while impairing atrial capture.
    • Propranolol significantly attenuated PPT, indicating a role for sympathetic activity.

    Conclusions:

    • Acetylcholine release during sinus node region pacing suppresses inherent sinus node acceleration mediated by catecholamines.
    • Acetylcholine is crucial for maintaining atrial capture during pacing and modulates PPT latency and magnitude.