however , the drug was subsequently discontinued in 5 patients because of cardiac side effects ( proarrhythmic effect in 2 , sinus bradycardia in 1 , complete atrioventricular block in 1 and new left bundle branch block in 1 ) and 10 patients died during flecainide therapy ( 1 with cerebral stroke , 3 with congestive heart failure and 6 with incessant ventricular tachycardia ) .
C0018787
cardiac
C0018802
congestive heart failure