<prompt> Dofetilide belong to?Class I antiarrythmicClass II antiarrythmicClass III antiarrythmicClass IV antiarrythmic  <response>: Ibutilide, dofetilide, sotalol, amiodarone are class 3 agents they are potassium channel blockers- they r broad spectrum antiarrhythmic agents they increase QT interval 