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.

Synonyms: Atrial Ectopic Beat, Atrial Premature Complexes, Premature Complexes, Atrial, Atrial Contraction, Premature, Premature Atrial Beats, Atrial Beats, Premature, Supraventricular Beats, Premature, Premature Atrial Complex, Ectopic Beats, Atrial, Premature Supraventricular Beat, Atrial Premature Complex, Atrial Extrasystole, Atrial Complices, Premature, Premature Atrial Contractions, Ectopic Beat, Atrial, Premature Supraventricular Beats, Atrial Premature Complices, Extrasystole, Atrial, Premature Complices, Atrial, Premature Atrial Contraction, Supraventricular Beat, Premature, Atrial Contractions, Premature, Premature Atrial Complices, Premature Complex, Atrial, Atrial Extrasystoles, Atrial Beat, Premature, Atrial Ectopic Beats, Extrasystoles, Atrial, Atrial Complex, Premature, Premature Atrial Beat