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Arrhythmias in hypertrophic obstructive and non-obstructive cardiomyopathy

M Borggrefe, H Kuhn, H H Königer

    European Heart Journal
    |November 1, 1983
    PubMed

    Insights

    Surgical myectomy for hypertrophic obstructive cardiomyopathy (HOCM) did not significantly alter complex ventricular arrhythmias. Post-operative monitoring showed similar rates of ventricular tachycardia and pairs in HOCM patients compared to pre-operative assessments.

    Area of Science:

    • Cardiology
    • Cardiac Surgery
    • Electrophysiology

    Background:

    • Hypertrophic cardiomyopathy (HOCM) impacts symptoms and hemodynamics.
    • Transaortic subvalvular myectomy offers a better prognosis than medical therapy for HOCM.
    • Complex ventricular arrhythmias are known prognostic factors in HOCM.

    Purpose of the Study:

    • To investigate the impact of surgical myectomy on ventricular arrhythmias in HOCM patients.
    • To compare pre-operative and post-operative arrhythmia burden in HOCM.
    • To analyze arrhythmia occurrence in hypertrophic non-obstructive cardiomyopathy (HNCM) as a reference.

    Main Methods:

    • Thirty-one HOCM patients underwent 48-hour ambulatory monitoring pre- and post-surgery.
    • Fifteen HNCM patients were also monitored.
    • Complex ventricular arrhythmias defined as pairs or non-sustained ventricular tachycardia (VT).

    Main Results:

    • No significant change in mean hourly ventricular extrasystole counts pre- vs. post-myectomy in HOCM.
    • 11 HOCM patients had complex arrhythmias pre-operatively; 13 had them post-operatively.
    • HNCM patients showed a low overall frequency of ventricular extrasystoles.

    Conclusions:

    • Surgical myectomy in HOCM does not appear to reduce the incidence of complex ventricular arrhythmias.
    • The occurrence of ventricular pairs and VT remained similar before and after surgery.
    • Further research is needed to understand the long-term electrophysiological effects of myectomy.

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