noninvasive stress and pharmacologic tests with procainamide and propafenone were studied as methods to identify patients with wolff-parkinson-white syndrome ( wpw ) who would otherwise be judged at risk of sudden death on the basis of electrophysiologic criteria : the shortest rr interval during induced atrial fibrillation less than or equal to 250 ms or accessory pathway anterograde effective refractory period less than or equal to 250 ms .
C0033429
propafenone
C0004238
atrial