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A bundle branch block is a defect of the bundle branches or fascicles in the electrical conduction system of the heart. bundle branch block is a defect of the bundle branches or fascicles in the electrical conduction system of the heart.
Left bundle branch block (LBBB) is an abnormal pattern seen on the electrocardiogram (ECG), which indicates that the cardiac electrical impulse is not being distributed across the ventricles of the heart in the normal way. 1  Read about the heartâs electrical system. 2  Read about the heartâs chambers and valves.