<prompt> Digoxin use in CHF associated with:HOCM Hyperophic obstructive cardiomyopathyHigh output failureAtrial fibrillation with high ventricular rateAll of the above  <response>: Digitalis is used for controlling the ventricular rate in atrial fibrillation. Digitalis reduces ventricular in atrial fibrillation by decreasing the number of impulses that are able to pass down the AV node and bundle of his. It increases ERP of AV node by direct, vagomimetic and antiadrenergic actions. Essentials of medical pharmacology, seventh edition, KD Tripathi, page no:519 