AV tachyarrhythmias consist of AVNRT, AVRT, nonparoxysmal junctional tachycardia, and junctional ectopic tachycardia. [15] Supraventricular arrhythmias may occur in the pre- and post-MI setting.

An example of AVNRT tachycardia is shown in Figure 1. The P waves are hidden within the QRS complex, as this is a slow-fast type of reentry mechanism.