束支传导阻滞(BBB)是常见的心脏远端传导系统异常,成人发生率约为1～2％。传导系统异常是心脏病的标记,约80％传导异常患者可发现伴有心脏病的证据,最多为冠心病,其次为高血压及高血压性心脏病、心脏瓣膜病、先天性心脏病、心肌病等。临床上不少心脏病患者首先发现BBB,而心脏病的症状出现较迟。BBB患者常有乏力、短暂性晕厥、胸痛、心力衰竭等症状,特别伴发心脏病者更然。传导系统异常常增加心电图诊断的困难。并且,BBB可发展为完全性心脏传导阻滞,可致猝死、晕厥、心绞痛及心衰,因此,识别BBB,估计其预后并作适当处理很重要。 BBB按其发生过程可分为慢性及急性二类,二类BBB的临床意义不尽相同,下面分述之。 Bundle branch block (BBB) ​​is a common heart distal conduction system abnormalities, the incidence of about 1 to 2% of adults. Abnormal conduction system is a marker of heart disease. About 80% of patients with abnormal conduction may find evidence of heart disease, up to coronary heart disease, followed by hypertension and hypertensive heart disease, valvular heart disease, congenital heart disease, cardiac muscle Sick and so on. Many clinical patients with heart disease first found BBB, and heart disease symptoms appear later. BBB patients often have fatigue, transient syncope, chest pain, heart failure and other symptoms, particularly associated with heart disease more obvious. Abnormal conduction system often increases the difficulty of ECG diagnosis. And, BBB can develop into complete heart block, can cause sudden death, syncope, angina and heart failure, therefore, to identify the BBB, to assess the prognosis and appropriate treatment is very important. BBB according to its occurrence can be divided into two categories of chronic and acute BBB clinical significance is different, described below.