classⅢ, majority of them are postassium blockers which primarily prolong refractory period, such as amiodarone, bretylium and sotolol; Ⅲ类为延长复极化时程的药物,如胺碘酮、溴苄胺、索他洛尔等;
Amiodarone is a class III antiarrhythmic agent used for various types of cardiac dysrhythmias, both ventricular and atrial. It was discovered in 1961. Despite relatively common side-effects, it is used in arrhythmias that are otherwise difficult to treat with medication.