in 8 patients , vpcs of the most frequent qrs morphology remained suppressed at lower procainamide concentrations and for longer times than did vpcs of the second most frequent qrs morphology ( escape procainamide concentration = 2.8 +/- 1.7 versus 5.4 +/- 2.3 micrograms/ml , p less than 0.025 ; time to escape 244 +/- 138 versus 98 +/- 114 min ; p less than 0.05 ) .
C0151636
vpcs
C0033216
procainamide