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Electrophysiologic effects of propranolol on sinus node function in patients with sinus node dysfunction

H C Strauss, M Gilbert, R H Svenson

    Circulation
    |September 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

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    Propranolol significantly slowed sinus node function in patients with sinus node dysfunction, increasing cycle lengths and sinoatrial conduction time. This suggests caution is needed when prescribing propranolol to these individuals.

    Area of Science:

    • Cardiology
    • Electrophysiology
    • Pharmacology

    Background:

    • Sinus node dysfunction (SND) affects cardiac rhythm and can cause significant symptoms.
    • Electrophysiologic studies are crucial for evaluating SND.
    • Beta-blockers like propranolol can impact sinus node function.

    Purpose of the Study:

    • To investigate the electrophysiologic effects of propranolol on sinus node function in symptomatic SND patients.
    • To assess changes in sinus cycle length, sinoatrial conduction time, and escape rhythm parameters.

    Main Methods:

    • Intravenous propranolol (0.1 mg/kg) administered to ten patients with symptomatic SND.
    • Electrophysiologic parameters including spontaneous sinus cycle length, sinoatrial conduction time (SACT), and maximum escape cycle were measured.

    Related Experiment Videos

  • Statistical analysis to determine the significance of propranolol's effects.

    • Main Results:

    • Propranolol increased mean spontaneous sinus cycle length by 17.4% (924 to 1085 msec, P < 0.005).
    • Mean estimated SACT increased from 179 to 213 msec (P < 0.025).
    • One patient experienced reappearance of second-degree sinoatrial block; two patients had prolonged maximum escape cycle.

    Conclusions:

    • Propranolol can significantly impair sinus node function in patients with SND.
    • The drug may induce or worsen bradyarrhythmias.
    • Caution is advised when using propranolol in patients diagnosed with sinus node dysfunction.