ENTRAINMENT TECHNIQUES FOR MAPPING ATRIAL AND VENTRICULAR TACHYCARDIAS

Many atrial tachycardias, atrial flutter, and postmyocardial infarctio n ventricular tachycardias are due to reentry through large ''macroree ntrant'' circuits, These circuits can be difficult to define by cathet er mapping of the activation sequence. Entrainment techniques allow th e relation of a mapping site to the reentrant circuit to be assessed o n a site-by-site basis during catheter mapping. Regions of abnormal co nduction that are in the reentrant circuit can be distinguished from b ystander sites outside the circuit, A mapping site classification to g uide catheter ablation is reviewed.