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Computer-assisted ex vivo, normothermic small bowel perfusion
M J Stangl1, J Krapp, D Theodorou
1Chirurgische Klinik der LMU München, Klinikum Grosshadern, Deutschland. Manfred.Stangl@gch.med.uni-muenchen.de
Summary
Researchers developed a computer-assisted ex vivo small bowel perfusion system. This system successfully maintained organ viability for 2 hours, enabling future studies on pretreatment protocols and ischemia/reperfusion injury.
Area of Science:
- Transplantation research
- Organ preservation techniques
- Surgical innovation
Background:
- Established a computer-assisted, normothermic, oxygenated, ex vivo, recirculating small bowel perfusion system.
- Utilized an organ chamber and syngeneic whole blood as perfusate for ex vivo organ studies.
Purpose of the Study:
- To investigate organ pretreatment protocols.
- To study ischemia/reperfusion phenomena in the small bowel.
- To establish a viable ex vivo small bowel model for research.
Main Methods:
- Harvested small bowel from Lewis rats for ex vivo perfusion (≥2 hours) at 37°C.
- Tested three perfusate groups: whole blood diluted with NaCl, Krebs' solution, or Krebs' solution with norepinephrine (hematocrit 30%).
- Computer-assisted system monitored pressure, oxygenation, flow, temperature, and pH, maintaining perfusion pressure at 100 mm Hg.
Main Results:
- Perfusion with NaCl resulted in hypersecretion, low vascular resistance, and no maltose uptake.
- Krebs' solution supported organ viability, with norepinephrine improving perfusion.
- Oxygen consumption remained stable, and maltose absorption was comparable to native small bowel.
Conclusions:
- The established ex vivo perfusion system supports small bowel viability for at least 2 hours.
- This model is suitable for studying leukocyte/endothelial interactions.
- The system facilitates testing pretreatment protocols to reduce small bowel allograft immunogenicity.