<prompt> Most common cause of sudden death -Ventricular fibrillationAtrial fibrillationPSVTA-V block  <response>: Ans. is a i.e., Ventricular fibrillation Ventricular fibrillation is the most frequent mechanism of sudden cardiac death : - accountsfor 60 of sudden deatho It is a rapid disorganized ventricular arryhthmia resulting in no uniform ventricular contraction, no cardiac output, and no recordable blood pressure.o Death from a ventricular tachyarryhthmia in the setting of an acute myocardial infarction has historically been one of the most frequent causes of sudden cardiac death.o 60 of the death associated with acute Ml occured within the first hour and were attributable to a ventricular arrhythmia. 