Lesson Progress
0% Complete

A definitive diagnosis of PDA is obtained with cardiac catheterization. A presumptive diagnosis of PDA can be obtained by auscultation.

  1. Auscultation:
  2. Radiology may see:
    • Left ventricular enlargement
    • Left atrial enlargement
    • Aortic bulge (12:00 – 1:00 o’clock on the V/D or D/V view)
    • Main pulmonary artery bulge (1:00 – 2:00 o’clock on the V/D or D/V view)
    • Left auricular bulge (2:00 – 3:00 o’clock on the V/D or D/V view)
    • Pulmonary venous congestion/pulmonary edema
    • Pulmonary overcirculation
  3. ECG may see:
    • normal ECG
    • left ventricular enlargement (tall R waves)
    • left atrial enlargement (tall P waves)
    • dysrhythmias both supraventricular and ventricular
    • signs of right ventricular enlargement with reverse PDA
  4. Blood Gas
    • normal with classical PDA
    • markedly reduced femoral arterial oxygen content with reverse PDA
  5. Echocardiography
    • left ventricular enlargement
    • left atrial enlargement
    • turbulence in main pulmonary artery (presumptive evidence of PDA) by Doppler
    • identification of the ductus arteriosus entering the pulmonary and color Doppler demonstrating left to right flow through the ductus arteriosus
    • signs of right heart enlargement with reverse PDA
  6. Cardiac Catheterization
    • Selective angiography of the ductus arteriosus confirming a PDA with left to right or right to left shunt

Comments: The finding of a continuous murmur is strong evidence for PDA and is usually sufficient to warrant surgery