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There were 49 insulin-dependent diabetics who received 52 renal allografts: 13 from living related and 39 from cadaveric donors. The mean age and time on dialysis were similar for both recipient groups. Patient survival at 1 and 2 years was 100 per cent for living related donor recipients, and 76 and 56 per cent at 1 and 2 years for cadaveric recipients. Renal allograft survival was 92 and 85 per cent at 1 and 2 years for living related donor recipients. Cadaveric allograft survival was 49 and 41 per cent at 1 and 2 years. The cumulative mortality rate was 39 per cent and the over-all surgical morbidity was low. Renal transplantation in diabetic patients is worthwhile from the standpoint of patient and allograft survival.

Of 505 consecutive renal transplants urologic complications occurred in 4.1 per cent of cadaver, 2.6 per cent of living related, 1.9 per cent of diabetic and 3.8 per cent of nondiabetic allografts. Over-all, patient survival and graft salvage rates were 94 and 83 per cent, respectively. Principles of prevention, diagnosis and management of these complications are discussed. In contrast to prior standards the bladder catheter was removed within 36 hours postoperatively in nearly all cases without any increase in morbidity.

A prospective, single-blinded study was done to determine the ability of serial 99mtechnetium-diethylenetriaminepentaacetic acid scans to diagnose renal allograft rejection. Among 28 transplant recipients 111 renal scans were obtained 1 day postoperatively and every 3 to 4 days thereafter for 3 weeks in all patients retaining an allograft. Computer-generated time-activity blood flow curves were analyzed semiquantitatively for the 1) interval between curve peaks of the allograft and iliac artery, 2) renal transit time and 3) renal washout of radionuclide. Excretory function was assessed by degree and interval to appearance of radionuclide in the calices and bladder. Deterioration of renal blood flow and excretion compared to the initial scan was considered rejection. Of 52 scans performed during clinical rejection 47 (90.4 per cent) were interpreted as showing rejection (sensitivity). Of 53 scans interpreted as showing rejection 47 (88.7 per cent) were positive for clinical rejection. The remaining 6 patients (initial false positive results) suffered clinical rejection within 24 to 72 hours. We conclude that 99mtechnetium-diethylenetriaminepentaacetic acid renal scans are useful in the differential diagnosis of renal allograft dysfunction.