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Electrophysiologic testing in bundle branch block and unexplained syncope.

F Morady, J Higgins, R W Peters

    The American Journal of Cardiology
    |September 1, 1984
    PubMed
    Summary
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    Electrophysiologic testing identifies significant abnormalities in about half of patients with bundle branch block and syncope, guiding successful long-term management and preventing recurrent fainting.

    Area of Science:

    • Cardiology
    • Electrophysiology

    Background:

    • Bundle branch block (BBB) and unexplained syncope are common clinical challenges.
    • Electrophysiologic testing (EP) is crucial for diagnosing underlying cardiac causes of syncope.

    Purpose of the Study:

    • To evaluate the diagnostic yield and prognostic value of EP testing in patients with BBB and syncope.
    • To assess the effectiveness of EP-guided management strategies.

    Main Methods:

    • Thirty-two patients with BBB and syncope underwent comprehensive EP testing, including programmed ventricular stimulation.
    • Infranodal conduction time (HV interval) and inducible ventricular arrhythmias were assessed.
    • Management decisions were based on EP findings, with pacemaker implantation or antiarrhythmic drug therapy.

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    Main Results:

    • Abnormalities such as prolonged HV interval (≥70 ms), infranodal block, or inducible ventricular tachycardia (VT) were identified in approximately 50% of patients.
    • Unimorphic VT was induced in 28% and polymorphic VT in 16% of patients.
    • Long-term management guided by EP testing was generally successful in preventing recurrent syncope, with only 2 patients experiencing recurrence.

    Conclusions:

    • EP testing is valuable in identifying significant electrophysiologic abnormalities in patients with BBB and syncope.
    • Management strategies based on EP findings, including pacemaker implantation and antiarrhythmic drug use, are effective in preventing recurrent syncope.
    • Sudden death occurred in 10% of patients at 45 months, highlighting the importance of risk stratification.