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Related Experiment Videos

Polymorphous ventricular tachycardia and atrioventricular block.

B Strasberg, J Kusniec, S Erdman

    Pacing and Clinical Electrophysiology : PACE
    |July 1, 1986
    PubMed
    Summary
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    Polymorphous ventricular tachycardia (PMVT) in patients with atrioventricular (AV) block is linked to longer QT intervals and frequent premature ventricular beats (PVBs). These findings suggest increased risk factors for developing PMVT during AV block.

    Area of Science:

    • Cardiology
    • Electrophysiology

    Background:

    • Polymorphous ventricular tachycardia (PMVT) can occur during atrioventricular (AV) block.
    • Understanding risk factors for PMVT in this population is crucial.

    Purpose of the Study:

    • To investigate the characteristics of patients with AV block who develop PMVT.
    • To identify ECG predictors of PMVT in patients with AV block.

    Main Methods:

    • Retrospective case series of nine patients with PMVT during AV block.
    • Comparison with a control group of patients with AV block but without PMVT.
    • Analysis of electrocardiogram (ECG) parameters including ventricular cycle length, QT interval, and QTc.

    Main Results:

    • Patients with PMVT during AV block had significantly longer QT and QTc intervals compared to controls.

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  • Frequent premature ventricular beats (PVBs) were observed in 7/9 patients with PMVT, versus 1/control.
  • PMVT episodes were typically short in duration.

    • Conclusions:

    • Longer QT intervals and the presence of PVBs on routine ECGs are associated with an increased risk of PMVT in patients with AV block.
    • A QT interval >0.60s and PVBs may indicate heightened risk for PMVT development.