Twenty three patients with mitral valve prolapse underwent ambulatory 20 to 24 hour electrocardiography to study the incidence and severity of ventricular arrhythmias. These arrhythmias were found in 20 cases (87 p. 100). Ventricular extrasystoles were usually grouped (14 cases) causing doublets in 8 cases and bursts of ventricular tachycardia in the 6 others. The importance of the information obtained by Holter monitoring should not detract from the value of the standard resting electrocardiogramme. In fact, there appears to be a good correlation between the severity of the ventricular arrhythmia and the presence of ST changes over the postero-inferior zones. These abnormalities were never present in patients without ventricular extrasystoles but on the other hand they were observed in 5 of the 6 patients with ventricular tachycardia. From a practical point of view this may represent a simple means of identifying patients at high risk of dangerous arrhythmias.
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