in the 11 non-responders with inducible sustained vt before and after both drugs , quinidine and ajmaline caused qualitatively and quantitatively similar alterations of vt characteristics including a significant prolongation of the interval between the initiation extrastimulus and the first beat of vt by 38 and 42 % ( p less than 0.01 ) , an increase in vt cycle length by 15 and 22 % ( p less than 0.01 ) and a prolongation of the qrs duration during vt by 15 and 18 % ( p less than 0.01 ) , respectively .
C0034414
quinidine
C0042514
vt