Which of the following is true regarding a left bundle branch block (LBBB)?

Which of the following is true regarding a

Multiple choice — select the best answer

AIt is also known as Mobitz II block
BThe QRS complex is prolonged
CThe PR interval is shortened
DThere are significant ST segment changes in lead III

✓ Correct answer: B. The QRS complex is prolonged Answer: The QRS complex is prolonged A left bundle branch block (LBBB) results in the delayed or blocked conduction through the left bundle branch. This leads to a widening of the QRS complex on an EKG, typically over 0.12 seconds. The PR interval remains normal, and LBBB is not characterized by ST segment changes specific to lead III. Mobitz II block is a type of second-degree AV block, not related to LBBB.

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Which of the following is true regarding a left bundle branch block (LBBB)?

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