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Differential shunting in the diagnosis of patent ductus arteriosus with Eisenmenger physiology by radionuclide angiography.

Radionuclide angiography and static whole body imaging performed with technetium-99m-labeled particulates can clearly demonstrate differential shunting in patients with patent ductus arteriosus (PDA) with Eisenmenger physiology. The anatomic arterial relationships in this condition which direct deoxygenated blood into the lower body (differential cyanosis) produce specific radionuclide images characterized by differential shunting of the technetium-99m-labeled particulates into the abdomen and lower extremity.