the following criteria were considered to be indications for use of fab fragments : the appearance of life-threatening arrhythmias such as high-grade atrioventricular conduction disorders ( grade 2 and 3 a-v block ) , multifocal ectopic beats , ventricular tachycardia , and relapsing ventricular fibrillation .
C0003811
arrhythmias
C0042510
ventricular fibrillation