Dofetilide belong to?: (A) Class I antiarrythmic, (B) Class II antiarrythmic, (C) Class III antiarrythmic, (D) Class IV antiarrythmic
Answer is C. Ibutilide, dofetilide, sotalol, amiodarone are class 3 agents they are potassium channel blockers- they r broad spectrum antiarrhythmic agents they increase QT interval