Objective To investigate the possible relation of atrial fibrillation ( AF) with the total activity of protein kinase C ( PKC) and the quantity of PKC(α,β) in the left auricle tissues of the patients with mitral disease. 目的探讨二尖瓣病变患者左房心肌总蛋白激酶C(PKC)活性及PKCα、β亚类含量与心房颤动(AF)之间可能存在的关系。