however , during the transition from vt to ventricular fibrillation , nonreentrant mechanisms arising both in the subendocardium and subepicardium led to very rapid acceleration of the tachycardia to the coupling interval of 92 +/- 2 msec , resulting in enhanced functional block and further conduction delay , with the total activation time of the transition beats exceeding the coupling interval of the tachycardia .
C0042514
vt
C0039231
tachycardia