Second Heart Sound - Physiologically Split #2

Unlock lessons, quizzes and more.

Sign Up
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).

Second Heart Sound - Physiologically Split #2
The recommended auscultation position for the stethoscope is the Pulmonic position. For this sound, use stethoscope's Diaphragm.


maneuver
The recommended patient position is Supine

Phonocardiogram

waveform
This waveform plots sound amplitude on the vertical axis against time on the horizontal axis.

Heart Animation

CaseID44
CourseID24
CourseCaseOrder1
ID32