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Opening Snap and Second Heart Sound 101

In this recording we present an opening snap occurring early in diastole along with a single second heart sound can mimic a split second heart sound. An opening snap is caused by thickened valve leaflets. When they open it produces a snapping sound. The more severe the thickening the earlier in diastole the opening snap occurs. In this example you are hearing an opening snap which occurs 75 milliseconds after the start of the second heart sound.

Auscultation Sounds

auscultation sound from lesson
waveform

Patient Recording of Opening Snap and Second Heart Sound 101

patient heart or lung sound
Opening Snap and Second Heart Sound 101

Patient Recording - Half Speed

patient auscultation point for Opening Snap and Second Heart Sound 101
Opening Snap and Second Heart Sound 101

Position

Patient position for auscultation
The patient's position should be supine.

Listening Tips for Opening Snap and Second Heart Sound 101

Diastole:Snap early in diastole, higher-pitch than S2

Waveform (Phonocardiogram)



Observe Cardiac Animation for Opening Snap and Second Heart Sound 101

An opening snap is caused by thickened valve leaflets. When they open it produces a snapping sound. The more severe the thickening the earlier in diastole the opening snap occurs. In this example you are hearing an opening snap which occurs 75 milliseconds after the start of the second heart sound.
Authors and Sources

Authors and Reviewers


Sources

Return to Reference Guide Index Page
Opening Snap and Second Heart Sound 101 | #52




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