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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.
Right bundle branch block (RBBB) is a distinctive pattern seen on the electrocardiogram (ECG) that occurs when the cardiac electrical impulse is interrupted as it spreads across the ventricles of the heart. 1  Read about the heartâs electrical system. 2  Read about the heartâs chambers and valves.