This is a normal first and second heart sound 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 Audio
First and Second Heart Sounds - Normal and Unsplit Sounds
Half Speed First and Second Heart Sounds - Normal and Unsplit Sounds
Technique
The patient's position should be supine.
Auscultation Tips for First and Second Heart Sounds - Normal and Unsplit
Sound Wave
First and Second Heart Sounds - Normal and Unsplit 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
- EKG heart rhythm modules: Thomas O'Brien.
- EKG monitor simulation developer: Steve Collmann
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12 Lead Course: Dr. Michael Mazzini, MD.
- Spanish language EKG: Breena R. Taira, MD, MPH
- Medical review: Dr. Jonathan Keroes, MD
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Heart sounds and mentorship: W. Proctor Harvey, MD
- Medical review: Dr. Pedro Azevedo, MD, Cardiology
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Last Update: 1/8/2023
Sources
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Electrocardiography for Healthcare Professionals, 5th Edition
Kathryn Booth and Thomas O'Brien
ISBN10: 1260064778, ISBN13: 9781260064773
McGraw Hill, 2019 -
Rapid Interpretation of EKG's, Sixth Edition
Dale Dublin
Cover Publishing Company -
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 - Clinical Heart Disease
W Proctor Harvey, MD
Clinical Heart Disease
Laennec Publishing; 1st edition (January 1, 2009) -
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
First and Second Heart Sounds - Normal and Unsplit | #32
