双束支主干阻滞依双束支传导速度、阻滞程度、传导比例、是否同步可产生多种复杂的心电图表现;同一心电图表现可以是不同部位、或同一部位不同程度的阻滞;同一双束支阻滞可由于心率变化或逸 Double bundle branch block according to double bundle branch conduction velocity, degree of block, conduction ratio, whether synchronization can produce a variety of complex ECG performance; the same ECG performance can be different parts, or the same part of the degree of block; the same double Bundle branch block may be due to changes in heart rate or escape