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Walk the Even Hospital Database by book and chapter — the raw source passages that ground Ask, DDx, and the rest.

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©2013 UpToDate ® Print Email Bilateral bundle branch block Blocked or delayed conduction in both the left and right bundle branches leads to wide QRS complexes, which in this case have coexisting complexes with a left or right bundle branch block morphology. The first two beats have the appearance of a right bundle branch block, followed by four normal beats, and then beats with the appearance of a left bundle branch block.