First and Second Heart Sounds - Normal and Unsplit 72

On this page, we present normal first and second heart sounda at 60 beats per minute. You are auscultating at the Mitral valve area (Apex). The first heart sound has slightly greater intensity than the second heart sound.
  • The first heart sound is produced by the closing of the mitral and tricuspid valve leaflets.
  • The second heart sound is produced by the closing of the aortic and pulmonic valve leaflets.
  • The second heart sound is unsplit when the subject is holding his or her breath at peak expiration.

First and Second Heart Sounds - Normal and Unsplit 72 Audio

First and Second Heart Sounds - Normal and  Unsplit 72 auscultation sound from lesson
waveform

First and Second Heart Sounds - Normal and Unsplit 72 Sounds

patient heart or lung sound
First and Second Heart Sounds - Normal and  Unsplit 72 patient recording

Half Speed First and Second Heart Sounds - Normal and Unsplit 72 Sounds

patient heart or lung sound
First and Second Heart Sounds - Normal and  Unsplit 72 half speed

Technique

Patient position
The patient's position should be supine.

Auscultation Tips for First and Second Heart Sounds - Normal and Unsplit 72

Sound Wave



First and Second Heart Sounds - Normal and Unsplit 72 Video

The first heart sound is produced by the closing of the mitral and tricuspid valve leaflets. The second heart sound is produced by the closing of the aortic and pulmonic valve leaflets.
Authors and Sources

Authors and Reviewers


Sources

  • Electrocardiography for Healthcare Professionals, 6th Edition Kathryn Booth and Thomas O'Brien
    ISBN10: 1265013470, ISBN13: 9781265013479
    McGraw Hill, 2023
  • Rapid Interpretation of EKG's, Sixth Edition
    Dale Dublin
    Cover Publishing Company
  • EKG Reference Guide
    EKG.Academy
  • 12 Lead EKG for Nurses: Simple Steps to Interpret Rhythms, Arrhythmias, Blocks, Hypertrophy, Infarcts, & Cardiac Drugs
    Aaron Reed
    Create Space Independent Publishing
  • Heart Sounds and Murmurs: A Practical Guide with Audio CD-ROM 3rd Edition
    Elsevier-Health Sciences Division
    Barbara A. Erickson, PhD, RN, CCRN
  • The Virtual Cardiac Patient: A Multimedia Guide to Heart Sounds, Murmurs, EKG Jonathan Keroes, David Lieberman
    Publisher: Lippincott Williams & Wilkin)
    ISBN-10: 0781784425; ISBN-13: 978-0781784429
  • Project Semilla, UCLA Emergency Medicine, EKG Training Breena R. Taira, MD, MPH
  • ECG Reference Guide
    PracticalClinicalSkills.com
Return to Reference Guide Index Page
First and Second Heart Sounds - Normal and Unsplit 72 | #32




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