2. Left Bundle Branch Block Subtypes

In addition to the traditional left bundle branch block, two partial blocks can also occur. Doctors often refer to a partial block as fascicular block; they can develop in the front or back half of the left bundle branch. These conditions are the left anterior fascicular block and the left posterior fascicular block, respectively. The same conditions that typically cause left bundle branch block can also cause both types of fascicular block. In general, left posterior fascicular block is rare.

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