<prompt> Propranolol is useful in the treatment of all of the following exceptAnginaPaial atrioventricular blockIdiopathic hyperophic subaic cardiomyopathyFamilial tremor  <response>: Ref-KDT 6e p142,143 Beta blockers are contraindicated in hea block because this can conve paial AV block to complete AV block. These agents are the drugs if choice for HOCM 