Second Heart Sounds

Second Heart Sound - Physiologically Split #2 - Auscultation Lesson

The second heart sound (S2) is created by the closing of the aortic valve followed by the closing of the pulmonic valve. Careful analysis of the splitting and intensity of the second heart sound can indicate the presence of many cardiac abnormalities. This example shows normal physiological splitting of the second heart sound. Splitting varies between zero and eighty milliseconds depending on the phase of the respiratory cycle. The aortic component of S2 (S2A) precedes the pulmonic component (S2P).

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The patient's position is supine.

Second Heart Sound - Physiologically Split #2 - Auscultation Lesson

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