Etiology and prognosis in acute post-transplant renal failure.

During the last seven years we encountered 117 cases of acute renal failure after 492 renal transplants. The affected patients fall into two general groups that can be broadly identified by an 131I-Hippuran renogram: Those in whom low or no uptake is evident on the renogram (group 1) and those in whom good uptake is evident on the renogram (group 2). Fifty per cent of the patients in group 1 have renal arterial thrombosis or hyperacute rejection. These patients should have a renal arteriogram, and immediate nephrectomy may be necessary. The prognosis in these patients is very grave. In group 2, 89 per cent of the patients have acute tubular necrosis, and they do not differ prognostically from patients who experience immediate renal function. Invasive diagnostic procedures should be avoided in this group because they may increase the mortality rate. We believe that repeated renograms, a reduction in azathioprine dosage and careful dialysis is the only treatment necessary.