by quantitating electrocardiogram intervals , arrhythmia frequency , and plasma concentrations , we found that , in poor metabolizers , arrhythmia suppression and ventricular complex ( qrs ) prolongation were correlated positively with encainide concentrations ( r greater than or equal to 0.570 , p less than 0.014 ) .
C0003811
arrhythmia
C0085251
encainide