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First Heart Sound with Aortic Ejection Click Lesson

Virtual Auscultation

patient torso with stethoscope chestpiece

patient position during auscultation
The patient's position is sitting.

Lesson

An aortic ejection click is produced by thickened aortic valve leaflets. These clicks can be generated in a bicuspid aortic valve, which is a congenital abnormality with two aortic valve leaflets instead of the three normal leaflets.

A single first heart sound (S1) followed by an aortic ejection click (AEC) can mimic a split first heart sound. An AEC follows S1 by 50 milliseconds. An AEC will have a higher pitch and shorter duration than S1. The recommended auscultation point is the aortic valve area where splitting of S1 is not heard.

Waveform




Heart Sounds Video

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.


Authors and Sources

Authors and Reviewers

Sources

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