Opening Snap and Second Heart Sound
Opening Snap and Second Heart Sound
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


Patient Recording


Patient Recording - Half Speed Playback


Position

The patient's position should be supine.
Listening Tips
Diastole:Snap early in diastole, higher-pitch than S2Waveform (Phonocardiogram)
Observe
//embedding heart animation
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
These authors contributed the audio recordings and text found in this reference guide: Jon Keroes, MD,Diane Wrigley, PA, and David Lieberman.Medically reviewed by Dr. Barbara Erickson, PhD, RN, CCRN.
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