<prompt> Digoxin is contraindicated in:Supraventricular tachycardiaAtrial fibrillationCongestive heart failureHypertrophic obstructive cardiomyopathy  <response>: Ans. D Hypertrophic obstructive cardiomyopathyRef: KDT 8the p560, 561Non selective b-blockers propranolol are the agents of choice for HOCM.In hypertrophic obstructive cardiomyopathy HOCM, the LV outflow tract is narrowed during systole due to hypertrophic septum. Obstruction is worsened by:a Factors increasing myocardial contractility.-Digitalis-Sympathetic stimulationb Factors decreasing LV filling:-Valsalva maneuver-Peripheral vasodilators 