Improved 72-hour renal preservation with phosphate-buffered sucrose

Area of Science:

• Organ transplantation
• Renal physiology
• Preservation solutions

Background:

• Hypothermic storage is crucial for organ preservation during transplantation.
• Selecting an optimal preservation solution impacts graft survival and function.
• Canine kidney autotransplantation models are used to evaluate preservation strategies.

Purpose of the Study:

• To compare the efficacy of phosphate buffered sucrose (PBS) solution versus hyperosmolar citrate (HOC) solution for canine kidney preservation.
• To evaluate the impact of preservation solutions on post-reperfusion renal blood flow and graft function.
• To assess long-term graft survival and recovery of renal function after 72-hour hypothermic storage.

Main Methods:

• Canine kidneys were preserved using either PBS or HOC solution for 72 hours.
• Kidneys underwent autotransplantation with immediate contralateral nephrectomy.
• Post-reperfusion renal blood flow was measured.
• Serum creatinine, urea levels, inulin clearance, and urine concentrating ability were monitored.

Main Results:

• Kidneys preserved with PBS showed significantly better post-reperfusion renal blood flow compared to HOC.
• All canine grafts preserved with PBS (5/5) survived with primary function, versus one graft in the HOC group (1/5).
• PBS group exhibited lower early serum creatinine and urea levels, with faster recovery of renal function, including tubular function and urine concentration.

Conclusions:

• Phosphate buffered sucrose (PBS) solution is superior to hyperosmolar citrate (HOC) for 72-hour hypothermic preservation of canine kidneys.
• PBS preservation leads to improved graft survival, better renal blood flow, and more rapid functional recovery post-transplantation.
• PBS demonstrates significant advantages over HOC in preserving kidney viability and function for transplantation.