both napa and quinidine immediately prolonged the atrial flutter cycle length in all dogs , from 118 +/- 15 to 141 +/- 18 ms and from 119 +/- 17 to 153 +/- 21 ms , respectively ( both p less than 0.001 ) , and then terminated atrial flutter in 11 of the 12 napa studies and in 6 of the 10 quinidine studies .
C0004239
atrial flutter
C0034414
quinidine