Second Heart Sound - Physiologically Split #2 | Auscultation #20 | Lesson with Audio

patient thorax when auscultating by stethoscope

patient position during auscultation
The patient was supine during auscultation.

Description

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).

Phonocardiogram

Anatomy

Second Heart Sound - Physiologically Split #2


Authors and Sources

Authors and Reviewers

Sources


? v:3 | onAr:0 | onPs:2 | tLb:0 | pv:1
uStat: False | db:0 | cc: | tar: False
| cDbLookup # 0



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