<prompt> Which is the most common benign cardiac rhythm?Atrial premature contractionAtrial fibrillationVentricular premature contractionVentricular tachycardia  <response>: Atrial premature contraction mc benign rhythm during extended ECG monitoring. Asymptomatic, although some patients experience palpitations or an irregularity of the pulse. ECG -Identification of P wave that occurs before the anticipated sinus beat. 