Auscultation Training by Repetition

First Heart Sound plus Aortic Ejection Click

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Listen for 2-3 minutes
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Sitting
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Diaphragm

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

Lesson Text

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.

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This website is only for medical professional education. Contact a healthcare provider for medical care. Copyright 2017 © MedEdu LLC. All Rights Reserved. About | Privacy Policy | Email