Supraventricular arrhythmia Premature atrial contractions MSH:D018880 SNOMEDCT_US:63593006 Ectopic supraventricular rhythms PACs human_phenotype Atrial ectopic beats A type of cardiac arrhythmia with premature atrial contractions or beats caused by signals originating from ectopic atrial sites. Atrial premature complex SNOMEDCT_US:406461004 SNOMEDCT_US:287057009 HP:0006699 SNOMEDCT_US:284470004 Premature supraventricular beats UMLS:C0033036