Intravenous pyelography in penetrating trauma.

Intravenous pyelograms (IVPs) are routinely used in the workup of suspected urologic injuries. The indications for obtaining IVPs have not been well characterized. This study examined 67 patients with penetrating trauma who received formal IVPs with nephrotomography in the radiology department. Of 35 stab wounds, 19 patients presented without hematuria and accounted for only one positive IVP. No intervention was undertaken in this patient. There were 14 stab wound patients with microscopic hematuria, with three positive IVPs. No intervention was necessary in any of these patients. The two remaining stab wound patients both had gross hematuria and renal injuries requiring intervention. However, only one of the two had a positive IVP, showing a blurred kidney margin. One patient had a pseudoaneurysm of a branch of the renal artery, and the other had an arteriovenous fistula. Of 32 patients with gunshot wounds, 15 presented without hematuria. Of the 15, one had a positive IVP but did not have a renal injury on exploration. None of the other 13 patients in this group undergoing exploration had renal injuries. Of the 11 patients with microscopic hematuria, three had hematomas and one had gross extravasation on IVP. Of the six patients with gross hematuria, three had positive IVPs, showing a hematoma, a renal fracture, and indistinct renal outline, respectively. In this limited study, omitting IVPs on the patients with negative urinalyses would not have missed any significant injuries. We suggest that more study is needed in this area because our present standard may lead to unnecessary expense and delay.