Technique Angiography was performed using standard sterile technique, local anesthesia with lidocaine 1% and conscious intravenous sedation. Visceral arteriography was performed in order to determine anatomy and identify variant arterial blood supply to the gut. A selection of 3 - 5 Fr. angiographic catheters was used at the discretion of the angiographer performing the procedure. The most frequently used catheters were 4 Fr. & 5 Fr. Cobra 2 and Rim catheters (Cook Inc., Bloomington, In.). Other catheters used included the Sos 2 (Angiodynamics Inc., Queensbury, NY.) and the 3Fr. Terumo SP co-axial catheter (Terumo Europe, N.V., Leuven, Belgium.). Once the catheter was in position, each drug was injected into the artery over approximately three minutes. After completion of the procedure, the catheter was removed and direct manual pressure over the arteriotomy maintained until hemostasis was achieved. Patients remained on complete bed rest with the involved extremity extended for 6 hours, in accordance with standard angiographic practice. Compression devices were not used.