Opening Snap and S2 Lesson

patient thorax when auscultating by stethoscope

patient position during auscultation
The patient was supine during auscultation.

Description

In this recording, listen for an opening snap that begins about 75 milliseconds after the commencement of S2. Such opening snaps in early in diastole and a single S2 can mimic a split second heart sound.

The source of an opening snap is thickened valve leaflets which produce a snapping sound when opening. The more severe the thickening the earlier in diastole the opening snap occurs.

Phonocardiogram

Anatomy

Opening Snap and S2

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

  • Heart and Lung Sounds Reference Library Diane S. Wrigley
    Publisher: PESI
  • Impact Patient Care: Key Physical Assessment Strategies and the Underlying Pathophysiology
    Diane S Wrigley & Rosale Lobo
  • Practical Clinical Skills: Lung Sounds
  • PESI Faculty - Diane S Wrigley
  • Case Profiles in Respiratory Care 3rd Ed, 2019
    William A.French
    Published by Delmar Cengage
  • Essential Lung Sounds by William A. French
    Published by Cengage Learning, 2011
  • Understanding Lung Sounds Steven Lehrer, MD
  • Clinical Heart Disease W Proctor Harvey, MD
    Clinical Heart Disease
    Laennec Publishing; 1st edition (January 1, 2009)
  • Heart and Lung Sounds Reference Guide
    PracticalClinicalSkills.com




An error has occurred. This application may no longer respond until reloaded. Reload 🗙