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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.
Best Answer: To understand bundle branch blocks, let's start with what bundles mean and why they are there. Your heart is an organ of muscles which contract at different times to beat and keep blood flowing. For these muscles to contract in sequence, they need electrical impulses which travel through these bundles.