预激综合征(以下简称预激征)患者约11～39%可并发房颤。当旁道(或称房室附加束)的前向传导不应期较正常房室结通道的不应期为短时,窦性或房性冲动经旁道频频下传,可落在前次心室活动的易损期,有发生室颤与猝死的危险。因此,预激征并发房颤为心血管病急症,及时的正确诊断和处理具有极重要的临床意义。 Pre-excitation syndrome (hereinafter referred to as pre-excitation) about 11 to 39% of patients with atrial fibrillation. When the bypass (or additional atrioventricular bundle) forward conduction refractory period than normal atrioventricular node should not be short period, sinus or atrial impulses frequently by the next pass, can fall in the previous Ventricular activity of the vulnerable period, there is the risk of ventricular fibrillation and sudden death. Therefore, pre-excitation of atrial fibrillation is a cardiovascular emergency, timely and correct diagnosis and treatment of extremely important clinical significance.