<prompt> A patient has been taking digoxin for several years and is about to receive atropine for some other indication. A common side effect of digoxin that can be blocked by atropine is:Decreased appetiteIncreased cardiac contractilityIncreased PR interval on the ECGTachycardia  <response>: Digitalis possesses vago-mimetic action - due to alteration in haemodynamics and direct CNS effects altering sympathetic activity, causes bradycardia and decreased A-V conduction ECG as increased PR interval. Atropine can block this adverse effect and it shows PR interval and increases HR. 