A bundle branch block refers to a defect of the heart's electrical conduction system.
The heart's electrical activity normally starts in the sinoatrial node (the heart's natural pacemaker), which is situated on the upper right atrium. From there the impulse travels to the left atrium and the atrioventricular node. From the AV node the electrical impulse travels down the Bundle of His and divides into the right and left bundle branches. The right ...
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Bundle Branch Block
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