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Related Experiment Videos

Bidirectional tachycardia a study of five cases.

S Gavrilescu, C Luca, C Streian

    Acta Cardiologica
    |January 1, 1976
    PubMed
    Summary

    Digitalis toxicity can cause bidirectional tachycardia, a complex heart rhythm. This arrhythmia can originate from different locations within the heart, even in patients with severe heart disease.

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    Area of Science:

    • Cardiology
    • Electrophysiology
    • Pharmacology

    Background:

    • Bidirectional tachycardia is a rare and complex arrhythmia.
    • Digitalis toxicity is a known cause of various cardiac arrhythmias.
    • Severe organic heart disease can predispose patients to arrhythmias.

    Observation:

    • Studied five patients with bidirectional tachycardia linked to digitalis toxicity and severe heart disease.
    • Utilized His bundle recordings and indirect clues to determine the origin of the tachycardia.
    • Observed the transition from junctional to ventricular tachycardia in one patient.

    Findings:

    • Bidirectional tachycardia can arise from either supra-Hisian or infra-Hisian origins.
    • In three patients, the tachycardia originated above the His bundle; in two, it originated below.
    • Similar electrocardiographic patterns of bidirectional tachycardia can result from different underlying mechanisms.

    Implications:

    • Understanding the origin of bidirectional tachycardia is crucial for effective management.
    • Digitalis toxicity should be considered in patients presenting with this arrhythmia, especially those with underlying heart conditions.
    • Further research is needed to fully elucidate the mechanisms of bidirectional tachycardia and its relationship with digitalis.

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