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Congenital Abnormalities

Patent Ductus Arteriosus Sounds

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This is an example of patent ductus arteriosus heard at the pulmonic position.

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 certain 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.

In the anatomy tab you can see an enlarged left atrium and left ventricle and turbulent blood flow from the aorta to the pulmonary artery through the patent ductus.

Patent Ductus Arteriosus
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The recommended auscultation position for the stethoscope is the Pulmonic position. For this sound, use stethoscope's Diaphragm.


maneuver
The recommended patient position is Supine

Phonocardiogram

waveform
This waveform plots sound amplitude on the vertical axis against time on the horizontal axis.

Heart Animation

Lessons
1Coarctation of the Aorta
2Patent Ductus Arteriosus checkmark
3Atrial Septal Defect
4Ventricular Septal Defect
5Tetralogy of Fallot
6Ebstein's Anomaly
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Practice Drill



Listening Tips
A synopsis of important sound features and timing for this abnormality.
Systole: Crescendo-decrescendo murmur, peaking late systole.
S2: Obscured.
Diastole: Crescendo-decrescendo murmur continuing from systole.
CaseID109
CourseID29
CourseCaseOrder2
ID99



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This website is only for medical professional education. Contact a healthcare provider for medical care. Copyright 2011-2020 © MedEdu LLC. All Rights Reserved. About | Privacy Policy | Email

  • mededu company logo
  • facebook like
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  • email share