What is disclosed is a system and method identifying a type of cardiac event from cardiac signals obtained from a subject. In one embodiment, at least two clusters are formed. Each cluster is associated with a different cardiac event based on features of interest identified from various cardiac signal segments. At least one of the clusters is associated with a cardiac event which is an arrhythmia and one of the clusters is associated with a non-arrhythmia. A new cardiac signal segment of a subject is received. The signal segment is analyzed to identify features of interest. A distance is calculated between each of the clusters and the identified features of interest obtained from having analyzed the subject's cardiac signal segment. A cardiac event is identified for the subject based on the type of cardiac event associated with the cluster which the subject's features of interest had a shortest distance to.