Patent ductus arteriosus MRI

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor-In-Chief: Priyamvada Singh, M.B.B.S. [2], Cafer Zorkun, M.D., Ph.D. [3],Ramyar Ghandriz MD[4] Assistant Editor-In-Chief: Kristin Feeney, B.S. [5]

Overview

Magnetic resonance imaging can be helpful as a diagnostic tool in conditions where the echocardiographic findings are inconclusive.

MRI

Magnetic resonance imaging (MRI) can be used as a diagnostic modality in congenital heart diseases.

Advantages

• It can be used in cases where echocardiographic results are inconclusive.
• Helps in measuring heart volumes, blood flow and ventricular wall thickness.
• The magnetic resonance angiography helps in better visualization of heart vasculature.
• Phase velocity mapping helps in measuring the ratio of pulmonary to systemic blood flow (Qp: Qs).

Disadvantages

• For successful MRI procedure breath-holding is required, which is sometimes difficult to achieve with small kids. Due to this, the procedure is done under general anesthesia in children.
• In patients with patent ductus arteriosus, the usage of MRI can demonstrate the abnormality and its severity. The magnitude of the shunt can also be determined by radionuclide flow studies.

Cardiac MRI demonstrates a patent ductus arteriosus. Pulmonary angiogram shows flow from the pulmonary artery to the descending aorta through a patent ductus (arrow), measuring 8 mm wide and 15 mm in length. RV: right ventricle; MPA: main pulmonary artery; PDA: patent ductus arteriosus; Des Ao: descending aorta. Case courtesy by Jaime Alfonso M. Aherrera et al.