it should be considered ( 1 ) in patients who are markedly symptomatic with refractory supraventricular tachycardia , ( 2 ) in those who have the potential for sudden cardiac death , ( 3 ) in younger patients with symptomatic tachycardia in whom there is concern about the long-term effects of antidysrhythmic treatment , and ( 4 ) in patients with tachycardia who are undergoing cardiac surgery for repair of associated conditions .
C0039240
supraventricular tachycardia
C0039231
tachycardia