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Related Experiment Videos

Programmed electrical stimulation in healed myocardial infarction using a standardized ventricular stimulation

M Zehender, P Brugada, A Geibel

    The American Journal of Cardiology
    |March 1, 1987
    PubMed
    Summary

    Programmed electrical stimulation accurately diagnosed ventricular arrhythmias in myocardial infarction patients. The protocol

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    Area of Science:

    • Cardiology
    • Electrophysiology
    • Medical Diagnostics

    Background:

    • Assessing diagnostic accuracy of programmed electrical stimulation (PES) in myocardial infarction (MI) patients.
    • Evaluating patients with and without a history of spontaneous ventricular arrhythmias (VAs).

    Purpose of the Study:

    • To prospectively assess the diagnostic accuracy of PES in identifying VAs in MI patients.
    • To determine the effectiveness of different PES protocols in inducing ventricular tachycardia (VT).

    Main Methods:

    • PES was performed in 111 MI patients using one, two, or three extrastimuli.
    • Stimulation occurred during sinus rhythm and ventricular pacing at varying rates.
    • Protocols were adjusted based on initial results to induce sustained monomorphic VT.

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    Main Results:

    • Repetitive ventricular responses were induced in all patients; 14% required DC shock for polymorphic VAs.
    • The incidence of induced VAs varied based on clinical arrhythmia history and stimulation protocol.
    • A third extrastimulus increased sustained monomorphic VT induction in patients with prior sustained monomorphic VT (68% to 94%).

    Conclusions:

    • PES is a valuable tool for diagnosing VAs in MI patients.
    • The stimulation protocol should be tailored based on the patient's documented arrhythmia history.
    • Induced VTs in patients without a history of sustained monomorphic VT were faster and associated with MI location.