we conclude that : ( 1 ) two of the previously proposed criteria for diagnosis of entrainment ( fixed fusion on the surface electrocardiogram and a first postpacing interval equal to the paced cycle length ) are overly restrictive criteria for definition of `` '' entrainment '' '' of vt , ( 2 ) analysis of endocardial recordings from the site of origin of tachycardia during attempted entrainment of vt is useful for documenting the presence of entrainment , and ( 3 ) such analysis provides a basis for the understanding of surface electrocardiographic phenomenon associated with entrainment .
C0039231
f tachycard
C0042514
f