<prompt> Digitalis is used in the treatment of acute CHF. It can also be used as a long-term maintenance therapy if CHF is associated with:HypeensionHyperophic obstructive cardiomyopathyAtrial fibrillationMitral stenosis  <response>: Digitalis- controlling VR ventricular rate in AF - CHF. It cant curereve AF to sinus rhythm. It VR by ing no. of impulses that pass down the A-V nodeAVN bundle of His. ERP of AVN by vagomimetic antiadrenergic actions: min. interval bw consecutive impulses that can traverse conducting tissue. Long ERP of AVN - many atrial impulses 500min falling in the RRP get extinguished by decremental conduction concealed impulses 