Patent Ductus Arteriosus Lesson #699
The patient was supine during auscultation.
Description
In this lesson, we discuss patent ductus arteriosus. Before birth, the two major arteries—the aorta and the pulmonary artery are connected by a blood vessel called the ductus arteriosus. Shortly after birth the patent ductus closes and turns into a ligament. However, in abnormal circumstances, the patent ductus remains open, allowing blood to flow from the aorta into the pulmonary artery causing a strain on the right ventricle. The first heart sound is normal. The second heart sound is obscured by a continuous crescendo-decrescendo murmur which runs from the beginning of systole to the end of diastole peaking at the second heart sound. This murmur can be auscultated at the pulmonic position. In the cardiac anatomy video, observe an enlarged left atrium and left ventricle. Turbulent blood flow from the aorta to the pulmonary artery through the patent ductus.
Phonocardiogram
Anatomy
Patent Ductus Arteriosus
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
