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Related Experiment Videos

Sinus node dysfunction caused by methyldopa and digoxin

J C Davis, J A Reiffel, J T Bigger

    JAMA
    |March 27, 1981
    PubMed
    Summary
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    Methyldopa and digoxin combination therapy can cause symptomatic sinus bradycardia in patients. Discontinuation of both medications resolved bradycardia, with continued digoxin use showing no recurrence.

    Area of Science:

    • Cardiology
    • Clinical Pharmacology

    Background:

    • Methyldopa is an antihypertensive agent.
    • Digoxin is a cardiac glycoside used for heart failure and arrhythmias.

    Observation:

    • Two patients developed symptomatic sinus bradycardia while concurrently taking methyldopa and digoxin.
    • Bradycardia was not observed when either drug was administered alone in these patients.

    Findings:

    • Discontinuation of methyldopa and digoxin therapy restored normal sinus node function in both patients.
    • Continued digoxin monotherapy did not result in recurrent bradycardia.

    Implications:

    • The combination of methyldopa and digoxin may pose a risk for sinus bradycardia.
    • Careful patient monitoring is recommended when prescribing these medications together.

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