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First Heart Sound plus Aortic Ejection Click

First Heart Sound plus Aortic Ejection Click

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.


Auscultation Sound From Lesson

auscultation sound from lesson
waveform


Patient Recording

patient heart or lung sound
First Heart Sound plus Aortic Ejection Click


Patient Recording - Half Speed Playback

patient heart or lung sound
First Heart Sound plus Aortic Ejection Click


Position

Patient position
The patient's position should be sitting.

Listening Tips

Systole:high-pitched sound, early in systole, short duration


Waveform (Phonocardiogram)





Observe Cardiac Animation

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.

First Heart Sound plus Aortic Ejection Click | #43

Authors and Reviewers

Authored by Dr. Jonathan Keroes, MD and Diane Wrigley, PA.
Medically reviewed by Dr. Barbara Erickson, PhD, RN, CCRN.
Last Update: 12/06/2021

Sources


Sources



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