Heart and Lung Sounds Reference Guide

Second Heart Sound - Physiologic Split Auscultation Reference

Patient Normal Speed

play
pause

Patient Half Speed

play
pause

Simulated Full Speed

play
pause

Lesson

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

During normal breathing, the timing between the aortic and pulmonic components of the second heart sound varies. This causes the second heart sound to be split.

Maximum splitting occurs at peak inspiration. In the example you are hearing the splitting of the second heart sound is 60 milliseconds at peak inspiration and zero splitting at peak expiration.

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 widest at peak inspiration.

Auscultation Method

The recommended patient position is supine

For this sound, use stethoscope's bell The recommended auscultation position for the stethoscope is pulmonic

Relevant Courses

If you wish to review a complete mobile concerning Second Heart Sound - Physiologic 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.

Normal Heart Sounds

Second Heart Sound - Physiologic Split Auscultation Reference