<unk> s <unk> s) also known as atrial premature complex (APC), premature atrial beat or  atrial premature beat (APB) is a benign type of premature heart beat which originates in one of the upper two chambers of the heart (the atria). <unk> s are to be distinguished from premature ventricular<unk> s (PVCs) that originate in one of the lower pumping chambers (the ventricles). <unk> s occur frequently in subjects with normal heart, however patients with structural heart disease and coronary heart disease are at increased risk.
Premature atrial contraction
Premature ventricular contraction
Pacemaker mediated tachycardia
Sinoatrial nodal reentry tachycardia
Wandering atrial pacemaker
Ectopic atrial rhythm
Ventricular escape beat
Incomplete left bundle branch block