Cardiac Complexes, Premature [Disease/Finding] Atrial Premature Complexes [Disease/Finding] 284470004 N0000003870 1023811 C7918 287057009 63593006 Extrasystole, Atrial Premature Atrial Beats D018880 C0033036 Premature Atrial Complex Atrial Premature Complexes Atrial Ectopic Beats A type of cardiac arrhythmia with premature atrial contractions or beats caused by signals originating from ectopic atrial sites. The ectopic signals may or may not conduct to the HEART VENTRICLES. Atrial premature complexes are characterized by premature P waves on ECG which are different in configuration from the P waves generated by the normal pacemaker complex in the SINOATRIAL NODE. M0028235 406461004 Atrial Premature Complexes Premature Supraventricular Beats Atrial Premature Complex Premature Atrial Contractions