ACUTE GASTROINTESTINAL HEMORRHAGE DETECTED BY SELECTIVE SCINTIGRAPHIC ANGIOGRAPHY

Intra-arterial Tc-99m colloid scintigraphy may have greater sensitivity than either standard intravenous scintigraphy or selective arteriography in detecting gastrointestinal bleeding. Ten millicuries of Tc-99m colloid were administered directly into the superior and inferior mesenteric arteries (SMA and IMA) of patients who had undergone selective arterial catheterization for the evaluation of gastrointestinal bleeding. In one patient, Tc-99m-albumin colloid was administered directly into the IMA and identified diverticular bleeding. The bleeding had been occult to prior contrast arteriography and refractory to selective intra-arterial Pitressin(R) therapy. In a second patient who had undergone three negative provocative angiograms, selective SMA injection of Tc-99m-sulfur colloid identified occult mesenteric varices secondary to portal hypertension. Selective intra-arterial scintigraphy should be valuable in detecting intestinal bleeding occult to conventional studies. This will help in directing further therapy and diagnostic evaluation.