Third Heart Sound Gallop | Auscultation Cheat Sheet with Sounds & Video | #84
A third heart sound occurs early in diastole. In young people and athletes it is a normal phenomenon. In older individuals it indicates the presence of congestive heart failure. The third heart sound is caused by a sudden deceleration of blood flow into the left ventricle from the left atrium. In the anatomy video you will see a thin-walled, dilated left ventricle with generalized decreased vigor of contraction. In the presence of a third heart sound (S3) the first heart sound is decreased in intensity while the second heart sound is increased in intensity. The third heart sound is a low frequency sound best heard with the bell of the stethoscope pressed lightly on the skin of the chest.Auscultation Audio
![auscultation sound from lesson](https://mededu.azureedge.net/public/images/auscPosition-M.png)
![waveform](https://mededu.azureedge.net/public/sounds/waveforms203/84.png)
Patient Sounds
![patient heart or lung sound](https://mededu.azureedge.net/public/images/auscPosition-M.png)
![Third Heart Sound Gallop](https://mededu.azureedge.net/public/sounds/waveforms203/5005.png)
Half Speed Patient Sounds
![patient heart or lung sound](https://mededu.azureedge.net/public/images/auscPosition-M.png)
![Third Heart Sound Gallop](https://mededu.azureedge.net/public/sounds/waveforms203/5005.png)
Technique
![Patient position](https://mededu.azureedge.net/public/images/Supine.png)
The patient's position should be supine.
Auscultation Tips
S1:Reduced intensityS2:Increased intensity
Diastole:S3 early in diastole, low-pitched, heard during expiration
Sound Wave
Observe Cardiac Animation
Authors and Sources
Authors and Reviewers
- ECG heart rhythm modules: Thomas O'Brien.
- ECG monitor simulation developer: Steve Collmann
-
12 Lead Course: Dr. Michael Mazzini, MD.
- Spanish language ECG: Breena R. Taira, MD, MPH
- Medical review: Dr. Jonathan Keroes, MD
- Medical review: Dr. Pedro Azevedo, MD, Cardiology
- Last Update: 11/8/2021
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
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ECG Reference Guide
PracticalClinicalSkills.com
Third Heart Sound Gallop | Auscultation Cheat Sheet with Sounds & Video | #84