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What does it mean to have a left bundle branch block on an EKG?

Left bundle branch block is when the heart doesn't beat evenly side-to-side.

The electrical activity generated by the heart starts in the natural pacemaker of the heart and travels down through the equivalent of an electrical circuit to cause the heart to beat. The circuit splits into 2 branches called bundles, the right and the left. When electricity does not go through the left bundle, it is called a left BBB, or bundle branch block.

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