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Cardiology MCQ 48

Q. A 62-year-old man is seen in the cardiology OPD. During cardiac examination, it is noted that the pulmonary component of the second heart sound occurs before the aortic component. Which one of the following is associated with this finding?
A) Pulmonary stenosis
B) Left bundle branch block
C) Right bundle branch block
D) Atrial septal defect

Answer: B- Left bundle branch block

Explanation:

This patient has reversed splitting of the second heart sound.
Left bundle branch block causes a reversed split second heart sound as it results in a delay in the aortic component.
Other common causes of the reversed splitting of second heart sound are:
Aortic stenosis
RV pacing
WPW syndrome (Type B)
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