Mid Systolic Click

Virtual Auscultation

patient torso with stethoscope chestpiece
patient position during auscultation

The patient's position should be supine.


The mid-systolic click is usually created by the sudden prolapse of the mitral valve leaflet into the left atrium. The anatomy video illustrates this mitral valve posterior leaflet prolapse.

Listen to the recording of a mid-systolic click recorded at the apex. The first and second heart sounds are normal, and no murmur is present.

In some cases, a late systolic murmur follow the mid-systolic click.


Heart Sounds Video

Play the animation and observe that the mitral valve posterior leaflet prolapses. The mid-systolic click is produced by the sudden prolapse of the leaflet.

Authors and Reviewers

Authored by Dr. Jonathan Keroes, MD and David Lieberman, Developer, Virtual Cardiac Patient. Medically reviewed by Dr. Barbara Erickson, PhD, RN, CCRN. Last Update: 11/28/2021

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