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Related Experiment Videos

Influence of digoxin on sinus node function after pharmacologic autonomic blockade.

N Treese, W Kasper, H J Gilfrich

    Klinische Wochenschrift
    |May 16, 1983
    PubMed
    Summary

    Digoxin does not directly affect normal sinus node function. This study found that after autonomic blockade, a single therapeutic dose of digoxin did not alter sinus cycle length, sinus node recovery time, or sinoatrial conduction time.

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    Area of Science:

    • Cardiology
    • Electrophysiology
    • Pharmacology

    Background:

    • The sinus node is the primary determinant of heart rate.
    • Autonomic influences significantly modulate sinus node function.
    • Digoxin is a cardiac glycoside used to treat heart failure and arrhythmias.

    Purpose of the Study:

    • To investigate the direct electrophysiologic effects of intravenous digoxin on normal sinus node function.
    • To assess whether digoxin alters intrinsic sinus node parameters independent of autonomic tone.

    Main Methods:

    • Ten patients underwent pharmacologic autonomic blockade using propranolol and atropine.
    • Sinus node electrophysiologic parameters (SCL, SNRT, SACT) were measured before and after blockade.
    • Parameters were re-evaluated 15, 30, and 45 minutes after administering 1 mg intravenous digoxin.

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    Main Results:

    • Autonomic blockade significantly decreased sinus cycle length, sinus node recovery time, and sinoatrial conduction time.
    • Following intravenous digoxin, no significant changes were observed in SCL, SNRT, or SACT at any time point.
    • These findings indicate digoxin did not exert a direct electrophysiologic effect on the sinus node.

    Conclusions:

    • A single therapeutic dose of intravenous digoxin does not have a direct impact on the intrinsic electrophysiologic properties of the normal sinus node.
    • Digoxin's effects on heart rate and rhythm are likely mediated through indirect mechanisms, such as altering autonomic balance or cardiac contractility, rather than direct sinus node modulation.