Heart and Lung Sounds Reference Guide

Aortic Regurgitation - Mild Auscultation Reference

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Lesson

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

This is an example of mild aortic regurgitation which can be caused by a bicuspid (thickened) aortic valve.

The first heart sound is diminished due to premature closure of the mitral valve leaflets.

An aortic ejection click follows the first heart sound by 75 milliseconds.

S2 is normal.

Systole is silent.

A high pitched decrescendo murmur occupying the first half of diastole can be heard starting immediately after the second heart sound.

The murmur is best heard at Erb's Point and can be accentuated by having the patient sitting up and leaning forward holding his breath after expiration.

In the animation you can see the turbulent blood flow from the aorta into the left ventricle during early diastole. You can see the minimally thickened aortic valve leaflets.

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.
S1: Can be soft.
Systole: Murmur may be present.
Diastole: Early diastole murmur.

Auscultation Method

The recommended patient position is sitting leaning forward

For this sound, use stethoscope's diaphragm The recommended auscultation position for the stethoscope is erbs-point

Relevant Courses

If you wish to review a complete mobile concerning Aortic Regurgitation - Mild 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.

Diastolic Murmurs

Aortic Regurgitation - Mild Auscultation Reference