Systolic Murmurs

Innocent Murmur 679 Lesson

patient thorax when auscultating by stethoscope

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 679

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: 11/10/2021

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
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)
Heart and Lung Sounds Reference Guide
PracticalClinicalSkills.com