The article analyses 188 cases treated for acute left ventricular insufficiency (ALVI) in different forms of tachyarrhythmia. It was established that in patients with supraventricular paroxysmal tachycardia ALVI develops when the rate of cardiac contractions is 180 +/- 3/min on the average, whereas in patients with cardiac fibrillation it develops when the rate of contractions is 163 +/- 4/min. For successful treatment of ALVI of a tachyarrhythmic character it is necessary to restore the sinus rhythm or slow down the rhythm of cardiac contractions in patients with supraventricular paroxysmal tachycardia to 113 +/- 5/min on the average and in patients with cardiac fibrillation to 118 +/- 2/min. Isoptin and obsidan produce the highest decelerating effect. In half of the patients with tachyarrhythmia. ALVI was relieved by means of antiarrhythmic agents among which obsidan and isoptin proved most effective.
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