premature cardiac contractions (Experimental Factor Ontology identifier EFO_0009275) is a type of cardiac arrythmia with ventricular or atrial contractions that are initiated early by an ectopic site (outside of the sinoatrial node). Also known as: cardiac ectopic complexes, cardiac ectopic contractions, cardiac ectopics, cardiac ectopy, premature cardiac complexes, supraventricular and ventricular ectopy.