Innocent Murmur Lesson #679
The patient was supine during auscultation.
Description
This recording is of an innocent murmur. Innocent murmurs are generated by normal blood flow within the heart. Blood flow turbulence creates vibrations in the heart's tissues which are then transmitted to the chest wall.
Benign, innocent murmurs are very common in children. This type of murmur is associated with non-cardiac conditions such as pregnancy, hyperthyroidism, exercise, and anemia in adults. When these conditions are treated appropriately, the systolic murmur disappears.
Use the stethoscope bell or diaphragm, auscultating over the pulmonic area. Listen for increasing sound intensity with inspiration. Innocent murmurs usually appear in early systole with low-to-mid-range-frequencies of 100-250Hz. The murmur is fairly short in duration. In this recording S1 and S2 are normal. Diastole is silent.
Phonocardiogram
Anatomy
Innocent Murmur
Authors and Sources
Authors and Reviewers
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Heart sounds by Dr. Jonathan Keroes, MD and David Lieberman, Developer, Virtual Cardiac Patient.
- Lung sounds by Diane Wrigley, PA
- Respiratory cases: William French
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David Lieberman, Audio Engineering
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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.
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Last Update: 11/10/2021
Sources
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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
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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) -
Heart and Lung Sounds Reference Guide
PracticalClinicalSkills.com
