Renal function after warm ischaemia. I. Effect of initial perfusate and its temperature

Area of Science:

• Nephrology
• Surgical Research
• Organ Preservation

Background:

• Warm ischemia can lead to significant kidney damage.
• Effective organ preservation strategies are crucial for transplantation and surgical outcomes.
• Evaluating different perfusion solutions is vital for improving post-ischemic renal function.

Purpose of the Study:

• To assess the efficacy of various in situ perfusion solutions in preserving renal function after warm ischemia in a rat model.
• To compare the protective effects of isotonic saline, plasma protein fraction, Perfudex, mannitol, Sacks' solution, and autologous blood against warm ischemic injury.

Main Methods:

• Rat kidneys underwent 60 minutes of warm ischemia followed by in situ perfusion with different solutions at 37°C or 4°C.
• Control groups included unilateral nephrectomy alone or with ischemia.
• Renal function was evaluated by plasma creatinine levels and survival rates post-contralateral nephrectomy.

Main Results:

• Perfusion with isotonic saline at 37°C and autologous arterial blood at body temperature significantly improved renal function compared to the 60-minute ischemia control group (p<0.05 and p<0.005, respectively).
• Other tested perfusates, including plasma protein fraction, Perfudex, mannitol, and Sacks' solution, did not show significant improvements in renal function.
• Perfusion at 4°C did not yield significant functional improvements across the tested solutions.

Conclusions:

• Isotonic saline and autologous arterial blood are effective perfusion solutions for mitigating warm ischemic injury in rat kidneys.
• The choice of perfusion solution is critical for preserving renal function after warm ischemia.
• Further research may explore optimizing these beneficial solutions or combinations for clinical application.