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Polymorphous ventricular tachycardia due to alpha-blockade.

M A James, W Culling, J Vann Jones

    International Journal of Cardiology
    |February 1, 1987
    PubMed
    Summary
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    Indoramin, an alpha-blocker, can cause polymorphous ventricular tachycardia due to its Class 3 anti-arrhythmic effects. This dose-dependent side effect, QT interval prolongation, has not been previously linked to indoramin or similar drugs.

    Area of Science:

    • Pharmacology
    • Cardiology
    • Clinical Medicine

    Background:

    • Indoramin is a post-synaptic alpha-blocking agent.
    • Alpha-blockers are commonly used for various cardiovascular conditions.
    • Understanding drug-induced cardiac side effects is crucial for patient safety.

    Observation:

    • A case of polymorphous ventricular tachycardia was observed.
    • The tachycardia was directly linked to indoramin treatment.
    • This adverse effect was noted at high doses of indoramin.

    Findings:

    • Polymorphous ventricular tachycardia is a rare but serious arrhythmia.
    • Indoramin exhibits Class 3 anti-arrhythmic properties, including QT interval prolongation.
    • The pro-arrhythmic effect is dose-dependent and associated with significant QT prolongation.

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    Implications:

    • Clinicians should be aware of the potential pro-arrhythmic risk of indoramin, particularly at high doses.
    • This finding expands the known side effect profile of alpha-blockers.
    • Further research may be warranted to explore the electrophysiological mechanisms and prevalence of this adverse effect.