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Related Experiment Videos

Ajmaline-induced torsade de pointes.

U Kaul, J C Mohan, J Narula

    Cardiology
    |January 1, 1985
    PubMed
    Summary

    A patient with myocardial disease experienced dangerous heart rhythms after ajmaline administration during an electrophysiology study. Prompt resuscitation was successful, highlighting ajmaline

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    Area of Science:

    • Cardiology
    • Electrophysiology
    • Pharmacology

    Background:

    • Primary myocardial disease presents unique challenges in cardiac electrophysiology.
    • Left bundle-branch block can alter ventricular conduction and repolarization.
    • Electrophysiologic studies are crucial for diagnosing and managing cardiac arrhythmias.

    Observation:

    • A patient with pre-existing myocardial disease and left bundle-branch block was administered intravenous ajmaline.
    • Following ajmaline injection, the patient developed significant QT prolongation.
    • The patient subsequently experienced torsade de pointes, a life-threatening ventricular arrhythmia.

    Findings:

    • Ajmaline can induce severe QT prolongation and torsade de pointes in susceptible patients.
    • The combination of primary myocardial disease and left bundle-branch block may increase risk.
    • Successful resuscitation was achieved one hour after the onset of tachycardia.

    Implications:

    • Caution is warranted when using ajmaline in patients with myocardial disease and conduction abnormalities.
    • QT interval monitoring is critical during ajmaline administration in electrophysiology studies.
    • This case underscores the importance of preparedness for managing drug-induced arrhythmias.

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