fifty percent or more reduction in the frequency of ventricular premature contractions ( vpcs ) was obtained in 24 of 43 patients ( 56 % ) with dp , in 24 of 44 ( 55 % ) with mx , in 18 of 29 ( 62 % ) with ap and 10 of 18 ( 56 % ) with cz .
C0151636
ventricular premature contractions
C0025887
mx