A QRS duration between 100 and 120 milliseconds suggests all of the following, Except:
Correct Answer: Left Bundle Branch Block
Description: Answer is D (Left Bundle Branch Block) Left Bundle Branch block is typically associated with a QRS duration greater than 120 milli seconds. Paial Blocks (Fascicular or hemiblocks) in the left bundle system (left anterior or posterior fascicular blocks) generally do not prolong the QRS duration substantially and QRS duration typically remains less than 120 milliseconds.
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