106 episodes of ventricular fibrillation were observed in 11 patients, 9 of whom had acute myocardial infarctions. The heart rate before the onset of ventricular fibrillation was below 50 in two episodes, 60 to 100 in 63, and above 100 in 41. 83 attacks of ventricular fibrillation were preceded by fewer than five ventricular premature beats, 23 by more than five, 19 by more than ten. Multifocal ventricular premature beats occurred ten times, runs of ventricular premature beats 11 times, with only three falling into the vulnerable period. Left bundle branch block was present in three patients, right bundle branch block with left anterior hemiblock in two, isolated left anterior hemiblock in two, left posterior hemiblock in one. 85 episodes of ventricular fibrillation occurred during antiarrhythmic treatment, 72 during lidocaine administration. Antiarrhythmic drugs were effective only in reducing the number of ventricular premature beats. The only successful treatment of recurrent episodes of ventricular fibrillation was repeated electrical countershocks.
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