ABSTRACT
The mechanism of reentry occurs when a cardiac impulse travels in a circular course, creating abnormal impulses that lead to premature beats and tachydysrhythmias. In contrast to the aberrant impulse development that occurs with altered automaticity, reentry is caused by defects in the conduction pathways in the heart. Reentry develops when two different limbs of a conduction circuit in the heart have a difference in refractory (electrical recovery time of the cardiac cells) periods.2
