in the 18 non-responders with inducible sustained vt after both drugs , quinidine and disopyramide caused qualitatively and quantitatively similar changes in the characteristics of the vt : prolongation of the interval between the initiating extrastimulus and the first beat of vt by 36 and 39 % , and an increase in vt cycle length by 21 and 29 % , respectively .
C0012702
disopyramide
C0042514
vt