Second Heart Sound - Physiologically Split Auscultation Reference

heart lung sounds waveform synthetic

Lesson

For heart sounds listen to the synthetic sound while reviewing this 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).

The waveform(s) seen above are a chart of sound amplitude (loudness) on the vertical axis against time on the horizontal axis.


Listening Tips

A summary of the key aspects of this heart or lung sound.
S2: Splitting, varying with respiratory cycle.

Auscultation Method

maneuver
The recommended patient position is supine
torso
For this sound, use stethoscope's diaphragm The recommended auscultation position for the stethoscope is pulmonic



Relevant Courses

If you wish to review a complete mobile concerning Second Heart Sound - Physiologically Split Auscultation Reference and related heart sounds, the modules(s) listed below may be useful. Each lesson includes text that explains the auscultatory sound and its clinical significance. The lesson also includes an audio track for playback. A waveform provides a great way to visualize the sounds. Finally, we also include an animation video. For heart sounds, the video illustrates heart muscle and valve movements along with blood flow. For lung sounds, the primary source of the sounds can be seen. Each module also includes a quiz.

Second Heart Sound - Physiologically Split Auscultation Reference







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