Third Heart Sound Gallop - Easy Auscultation

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Extra Heart Sounds (S3 and S4) Third Heart Sound Gallop

Virtual Auscultation

patient torso with stethoscope chestpiece

The patient's position is supine.

Lesson

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. 1

Waveform

Heart Sounds Video

Lessons

✓	Third Heart Sound Gallop.
Fourth Heart Sound Gallop 35.
Third and Fourth Heart Sound Gallop.
Summation Gallop at 120 beats per minute.

Take Quiz Authors and Sources

Authors and Reviewers

Heart sounds by Dr. Jonathan Keroes, MD and David Lieberman, Developer, Virtual Cardiac Patient.
Lung sounds by Diane Wrigley, PA
Respiratory cases: William French
David Lieberman, Audio Engineering
Heart sounds mentorship by W. Proctor Harvey, MD
Special thanks for the medical mentorship of Dr. Raymond Murphy
Reviewed by Dr. Barbara Erickson, PhD, RN, CCRN.
Last Update: 12/11/2022

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
Essential Lung Sounds Diane S. Wrigley, PA-C Published by MedEdu LLC
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)

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