Atrial Septal Defect

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This is an auscultation example of an atrial septal defect as heard at the pulmonic position.

Atrial Septal Defect is a congenital condition associated with abnormal blood flow between the left atrium and the right atrium.

Before birth there is a large connection between right and left atria. During development of the fetus the connection gradually disappears. However, in some cases the opening persists and is known as an atrial septal defect.

Both the first and second heart sounds are split. The second heart sound splitting is fixed at 80 milliseconds.

There is a brief diamond shaped murmur in early systole and another brief diamond shaped murmur in early diastole

In the anatomy tab you see an enlarged right atrium and right ventricle.

You see turbulent blood flow across the tricuspid valve between the right atrium and the right ventricle (the diastolic murmur). This is caused by blood flow from the left atrium into the right atrium through the atrial septal defect.

There is further turbulent flow into the pulmonary artery causing the systolic murmur.

Atrial Septal Defect
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

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Listening Tips
A synopsis of important sound features and timing for this abnormality.
Systole: Diamond shaped, brief, early murmur.
S2: Fixed splitting.
Diastole: Diamond shaped, brief, early murmur.
CaseID110
CourseID29
CourseCaseOrder3
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