Randomized preclinical study of machine perfusion in vascularized composite allografts

Area of Science:

• Transplantation research
• Organ preservation techniques
• Vascular surgery

Background:

• Ex vivo perfusion shows promise for limb preservation but faces challenges like metabolic acidosis and edema.
• Optimizing perfusion protocols is crucial for maintaining tissue health during transplantation.

Purpose of the Study:

• To determine the optimal temperature and mean arterial pressure for machine perfusion in limb preservation.
• To compare the efficacy of optimized machine perfusion against static cold storage.

Main Methods:

• A preclinical trial evaluated normothermic, subnormothermic, and hypothermic machine perfusion at varying pressures.
• The optimal machine perfusion protocol was compared head-to-head with static cold storage over 8 hours.
• Limbs were reperfused with allogeneic blood for 4 hours without immunosuppression.

Main Results:

• Normothermic machine perfusion at 70 mmHg (NMP-70) demonstrated reduced tissue injury and stable perfusion biochemistry.
• Static cold storage led to acidosis, increased lactate, and electrolyte imbalances, unlike NMP-70.
• Histological analysis revealed less ischemic injury and inflammation in NMP-70 preserved limbs compared to static cold storage.

Conclusions:

• Normothermic perfusion offers superior graft preservation compared to static cold storage.
• NMP-70 minimizes reperfusion injury and preserves limb viability more effectively.
• Optimized machine perfusion protocols are essential for advancing transplantation outcomes.