title: Subnormothermic machine perfusion protects against rat liver preservation injury: a comparative evaluation with conventional cold storage.
abstract: Hypothermic machine perfusion (MP) of the liver has been reported to improve graft function reclaiming marginal livers, such as those from non-heart-beating donors. Livers from obese donors often have fatty infiltrates and are more susceptible to hypothermic conditions. No data exist about MP at temperatures >4 degrees C. This study evaluated liver function after organ preservation by comparing MP at 20 degrees C with conventional cold storage.
  
  
  METHODS
  For MP, rat livers were perfused for 6 hours using an oxygenated Krebs-Henseleit (KH) solution at 20 degrees C (pH 7.4). For cold storage, livers were perfused in situ and preserved with Celsior solution at 4 degrees C for 6 hours. The reperfusion period with KH (2 hours at 37 degrees C) was performed under the same conditions both among livers preserved by MP or cold storage. Hepatic enzyme release (aspartate aminotransferase [AST], alanine aminotransferase [ALT], lactate dehydrogenase [LDH], and gamma-glutamyl transferase [GGT]), bile production, and ATP levels were measured during MP and reperfusion.
  
  
  RESULTS
  At the end of reperfusion, livers preserved by MP showed significantly decreased liver damage compared with cold storage: AST, 18 +/- 4 vs. 45 +/- 6 mU/mL (P < .01); ALT, 1.5 +/- .07 vs. 6 +/- 0.5 mU/mL (P < .01); and LDH, 82 +/- 2 vs. 135 +/- 29 mU/mL (P < .05). No difference was observed between bile production between MP and cold storage. High levels of biliary GGT and LDH were found in cold preserved livers. ATP levels were higher in livers preserved with MP compared with those preserved by cold storage.
  
  
  CONCLUSIONS
  MP at 20 degrees C resulted in a better quality of liver preservation, improving hepatocyte survival, compared with conventional cold storage. This may provide a new method for successful utilization of marginal livers, in particular fatty livers.
authors: Department of Internal Medicine and Therapeutics, San Matteo, Italy. vairetti@botta.unipv.it
authors: M
authors: M
authors: Vairetti
authors: A
authors: A
authors: Ferrigno
authors: V
authors: V
authors: Rizzo
authors: P
authors: P
authors: Richelmi
authors: E
authors: E
authors: Boncompagni
authors: D
authors: D
authors: Neri
authors: I
authors: I
authors: Freitas
authors: U
authors: U
authors: Cillo
mesh_terms: D000410:Alanine Transaminase / Q000032:analysis; D000818:Animals; D001219:Aspartate Aminotransferases / Q000032:analysis; D003080:Cold Temperature; D007035:Hypothermia; D007700:Kinetics; D007770:L-Lactate Dehydrogenase / Q000032:analysis; D008099:Liver / Q000201:enzymology; D008297:Male; D009926:Organ Preservation / Q000379:methods*; D051381:Rats; D017208:Rats, Wistar; D015427:Reperfusion Injury / Q000517:prevention & control*; D005723:gamma-Glutamyltransferase / Q000032:analysis
chemical_list: D007770:L-Lactate Dehydrogenase; D005723:gamma-Glutamyltransferase; D001219:Aspartate Aminotransferases; D000410:Alanine Transaminase