title: Monitoring the level of serum paraoxonase 1 activity in liver transplantation patients.
abstract: BACKGROUND
  Paraoxonase 1(PON1) is an ester hydrolase in serum and in the liver. Studies have suggested that PON1 measurement to the current battery of tests may improve the evaluation of chronic liver diseases. The aim of this study was to investigate the clinical significance of monitoring the level of serum PON1 activity in liver transplantation patients.
  
  
  METHODS
  A series of biochemical indexes were monitored in preoperative, operative and postoperative serum samples of 17 liver-transplanted patients. The change of serum PON1 level and its relations with other biochemical indexes were analyzed.
  
  
  RESULTS
  PON1 was distributed normally in the healthy population and its reference value ranged from 45.5 to 265.8 U/mL. The PON1 level of all patients was lower than that of control group significantly (P<0.001); the level began to elevate continuously 5 minutes after opening of the portal vein and was higher than that 90 minutes after opening of the portal vein (P<0.05). Two days after operation it was still higher than the normal. The levels of serum ALT and AST elevated more significantly after opening of the portal vein than before operation and they were higher than the normal values till 2 days after the operation.
  
  
  CONCLUSIONS
  The level of PON1 in serum may be taken as one of the effective indexes to assess whether the implant is alive and to monitor liver function of the patient together with other tests.
authors.affiliation: Clinical Laboratory, First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310003, China. genyunxu@sohu.com
authors.forename: Gen-Yun
authors.initials: GY
authors.lastname: Xu
authors.forename: Guo-Cai
authors.initials: GC
authors.lastname: Lv
authors.forename: Yu
authors.initials: Y
authors.lastname: Chen
authors.forename: Yong-Chuan
authors.initials: YC
authors.lastname: Hua
authors.forename: Shen-Mei
authors.initials: SM
authors.lastname: Zhu
authors.forename: Yi-Da
authors.initials: YD
authors.lastname: Yang
mesh_terms: D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D043303:Aryldialkylphosphatase / Q000097:blood* / Q000378:metabolism; D015415:Biomarkers / Q000097:blood; D015331:Cohort Studies; D005260:Female; D006084:Graft Rejection; D006085:Graft Survival; D006801:Humans; D017093:Liver Failure / Q000175:diagnosis / Q000601:surgery; D008111:Liver Function Tests; D016031:Liver Transplantation / Q000009:adverse effects / Q000379:methods*; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000379:methods*; D019990:Perioperative Care; D011336:Probability; D011379:Prognosis; D011446:Prospective Studies; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index
chemical_list: D015415:Biomarkers; D043303:Aryldialkylphosphatase