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Updated: May 6, 2026

Normothermic Machine Perfusion of Rat Kidneys for Transplantation
Published on: January 27, 2026
Kidney preservation: review of present and future perspective
F Catena1, F Coccolini, G Montori
1General and Trauma Surgery Department, Parma Hospital, Parma, Italy.
Abstract:
One of the main problems in transplant surgery is the preservation of the organ during the cold ischemic time. The interrupted blood supply triggers a cascade of biological modifications resulting in cell death, which predisposes to discharge of a large quantity of toxic metabolites at the moment of organ reperfusion. Many approaches have been studied to prevent the toxic processes. Immediately after procurement, kidneys are flushed with these solutions. Two main: techniques of organ preservation are cold static storage and hypothermic machine perfusion (HMP). Based on age and comorbidities, individuals can be generally divided into 2 groups: ideal and marginal donors. Characteristics of organs from marginal donors are associated with an increased rate of delayed graft function and primary graft nonfunction (PNF), which reduce transplant survival and increase the acute rejection risk. In the last 20 years, the United Network of Organ Sharing has reported a 170% increase in deceased donors older than 50 years of age. Techniques of perfusion have been demonstrated to play a pivotal role in graft function after transplantation. Some studies suggest that HMP may improve outcomes after transplantation.
Insights
Organ preservation during cold ischemic time is crucial for transplant success. Hypothermic machine perfusion (HMP) shows promise in improving outcomes, especially for marginal donor organs.
Area of Science:
- Transplantation Surgery
- Organ Preservation
- Nephrology
Background:
- Organ preservation during cold ischemic time is a major challenge in transplantation.
- Interrupted blood supply leads to cell death and toxic metabolite release upon reperfusion.
- Marginal donor organs are associated with higher risks of graft dysfunction and rejection.
Purpose of the Study:
- To review organ preservation techniques in transplantation.
- To evaluate the role of hypothermic machine perfusion (HMP) in improving graft outcomes.
- To address the challenges posed by an increasing number of marginal donor organs.
Main Methods:
- Review of existing literature on organ preservation techniques.
- Comparison of cold static storage and hypothermic machine perfusion (HMP).
- Analysis of outcomes associated with marginal donor organs.
Main Results:
- Hypothermic machine perfusion (HMP) is an alternative to cold static storage.
- Organs from marginal donors present increased risks for delayed graft function and primary graft nonfunction.
- Increasing use of older donors (over 50 years) necessitates improved preservation methods.
Conclusions:
- Hypothermic machine perfusion (HMP) may offer improved outcomes compared to traditional methods.
- Effective organ preservation is critical for successful transplantation, particularly with marginal donors.
- Advancements in perfusion techniques are vital given demographic shifts in organ donation.
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