First Heart Sound plus Aortic Ejection Click Auscultation Reference

heart lung sounds waveform patient normal speed
heart lung sounds waveform patient half speed
heart lung sounds waveform synthetic

Lesson

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

A single first heart sound (S1) followed by an aortic ejection click (AEC) can also mimic a split first heart sound. An AEC follows S1 by 50 milliseconds.

An aortic ejection click is caused by thickened aortic valve leaflets. This is commonly seen in a bicuspid aortic valve, a congenital abnormality where someone is born with two aortic valve leaflets instead of the normal three.

Listen carefully to the second sound of the pair. If it is an AEC it will have a shorter duration and a higher pitch than the first sound of the pair (S1).

The AEC is best heard at the Aortic valve area where splitting of S1 is not heard.

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.
Systole: High pitched sound, early in systole, short duration.

Auscultation Method

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



Relevant Courses

If you wish to review a complete mobile concerning First Heart Sound plus Aortic Ejection Click 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.

First Heart Sound plus Aortic Ejection Click Auscultation Reference







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