Normally, the SA node is responsible for triggering each heart beat that results in ventricular contraction.  However, if the ventricle does not receive triggering signals at a rate high enough, the ventricular myocardium itself becomes the pacemaker or produces escape beats.  This is called<unk> .
Idioventricular rhythm
Ventricular escape beat
Wide complex tachycardia
Narrow complex tachycardia
Junctional tachycardia
Atrioventricular dissociation
Ectopic atrial rhythm
Supraventricular arrhythmias