First Heart Sound - Decreased Intensity
First Heart Sound - Decreased Intensity
A decreased intensity first heart sound can be produced by various heart abnormalities, such as a viral infection of the heart called a cardiomyopathy. Other conditions include a previous heart attack and decreased thyroid function. The decreased intensity first heart sound is due to a decrease in the vigor of contraction of the left ventricle. See the anatomy video.Auscultation Sounds
Position
The patient's position should be supine.
Listening Tips
S1:Reduced intensityWaveform (Phonocardiogram)
Observe
//embedding heart animation
A decrease in the vigor of contraction of the left ventricle causes decreased intensity first heart sound.
Authors
These authors contributed the audio recordings and text found in this reference guide: Jon Keroes, MD,Diane Wrigley, PA, and David Lieberman.Medically reviewed by Dr. Barbara Erickson, PhD, RN, CCRN.
Sources
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Heart Sounds and Murmurs Across the Lifespan (with CD)
by Dr Barbara Ann Erickson
Publisher: Mosby
ISBN-10: 0323020453; ISBN-13: 978-0323020459 -
Heart Sounds and Murmurs: A Practical Guide with Audio CD-ROM 3rd Edition
Elsevier-Health Sciences Division
Barbara A. Erickson, PhD, RN, CCRN -
Heart Sounds Made Easy with CD-ROM: (with CD-ROM) 2nd Edition
Anthony P. Salmon
ISBN-13: 978-0443069079 - NCBI Review of Heart Sounds and Murmurs: A Practical Guide
-
The Virtual Cardiac Patient: A Multimedia Guide to Heart Sounds And Murmurs
Jonathan Keroes, David Lieberman
Publisher: Lippincott Williams & Wilkin)
ISBN-10: 0781784425; ISBN-13: 978-0781784429 -
Ventricular Function Curves in the Exercising Dog
JONATHAN KEROES , ROGER R. ECKER , and ELLIOT RAPAPORT
Circulation Research, Vol. 25, No. 5 -
Electrocardiographic changes associated with ritodrine-induced maternal tachycardia and hypokalemia
American Journal of Obstetrics Gynecology, VOLUME 154, ISSUE 4, P921-923, APRIL 01, 1986
Susan K Hendricks, MD, Jonathan Keroes, MD, Michael Katz, MD -
A Multimedia Guide to Heart Sounds and Murmurs
January 2007 JAMA The Journal of the American Medical Association 297(2):217-218
DOI:10.1001/jama.297.2.217. M. Saleem Seyal, MD, Reviewer
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
Stevben Lehrer, MD
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