Some effects of preservation and acute renal failure on function and proteinuria of renal transplants.

We assessed the effects of preservation on subsequent graft function by measuring and comparing creatinine and fractional protein clearances in 18 live-related (LR) and 38 cadaver-donor (CD) grafts, the latter selected on the basis of short warm ischemia times (less than 5 mins) and stable donor hemodynamic status prior to organ recovery. CD recipients with immediate graft function had lower initial creatinine clearances and greater fractional protein clearances than LR recipients. The role of preservation in producing greater fractional protein clearance was suggested by the observation of time-dependent increasing proteinuria during continuous hypothermic perfusion of four human CD kidneys and the significant correlation between the initial degree of proteinuria at onset of diuresis and the duration of cold preservation of those CD kidneys with immediate function. One-half of CD grafts, however, manifested acute renal failure (ARF) after implantation and in these grafts no correlation between cold preservation duration and fractional protein clearance at onset of diuresis was noted. Development of ARF in CD grafts was associated with still lower creatinine clearances, but higher fractional protein clearances during the first week of diuresis. These effects of preservation and those of preceding ARF on fractional protein clearances were no longer noted 2 wk after onset of diuresis in nonrejecting CD grafts. These observations suggest the presence of preservation-induced injury to grafts even when "immediate function" occurs.