<qa>  What is the name of the type of arrhythmia that is symptomatic or requires20. History of arrhythmia multifocal premature ventricular contractions PVCs, bigeminy, trigeminy, ventricular tachycardia, or uncontrolled atrial fibrillation which is symptomatic or requires treatment NCI CTCAE Grade 3 or 4 or asymptomatic sustained ventricular tachycardia. Atrial fibrillation, controlled on medication, is not excluded. 