First Heart Sound plus Aortic Ejection Click | Auscultation #19 | Lesson with Audio

patient thorax when auscultating by stethoscope

patient position during auscultation
The patient was sitting during auscultation.

Description

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.

Phonocardiogram

Anatomy

First Heart Sound plus Aortic Ejection Click

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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uStat: False | db:0 | cc: | tar: False
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