Splitting of the second heart sound (S₂) is normally most pronounced during which of the following?

Question

Quizplus · Accepted Answer

Splitting of the second heart sound is caused by a delay in the closure of the semilunar (pulmonary and aortic) valves. This delay is more pronounced during inhalation due to decreased intrathoracic pressure, which increases the filling time of the right ventricle and delays the closure of the pulmonary valve. Therefore, choice C (inhalation) is the best answer.

Splitting of the Second Heart Sound (S2) Is Normally Most

Splitting of the Second Heart Sound (S₂) Is Normally Most