Human Phenotype Ontology term HP_0006699 (Premature atrial contractions) is a type of cardiac arrhythmia with premature atrial contractions or beats caused by signals originating from ectopic atrial sites. Also known as: Atrial ectopic beats, Atrial premature complex, Ectopic supraventricular rhythms, PACs, Premature supraventricular beats.