title: Role of neopterin, C-reactive protein and myeloperoxidase in patients undergoing cardiopulmonary bypass.
abstract: OBJECTIVE
  The aim of the present study was to investigate the role of neopterin (NP), C-reactive protein (CRP) and myeloperoxidase (MPO) in patients undergoing coronary artery bypass grafting with or without cardiopulmonary bypass (CPB).
  
  
  METHODS
  Forty patients submitted for elective coronary artery bypass grafting were included in this prospective study. Patients were divided into two groups of 20 individuals, those who did not undergo CPB (group 1), aged 54.1 ± 13.5 years, and those who did (group 2), aged 60.2 ± 11.7 years. In group 1, there were 17 males and 3 females, while in group 2, there were 16 males and 4 females. Serum CRP, serum and urine NP and leukocyte MPO activity were measured preoperatively, at the end of surgery, and 4, 24 and 72 h after surgery using high-performance liquid chromatography, immunoturbidimetry and the reduction in o-dianizidine, respectively.
  
  
  RESULTS
  The level of serum NP was higher preoperatively and at the end of surgery (0 h), 4, 24, and 72 h after the operation in those who underwent CPB compared to those who did not. However, there was no significant difference in NP concentrations between the two groups at any time except 24 h after surgery (p = 0.002). Urine NP concentrations showed similar values preoperatively but increased postoperatively in both groups of patients. The only significant difference in urine NP concentration between the two groups occurred at 0 and 24 h after surgery (p = 0.001, p = 0.000). Serum CRP concentrations showed similar values preoperatively, at the end of surgery and 72 h after the operation and increased at 4 and 24 h postoperatively in both groups. The only significant difference in CRP concentration between the two groups occurred 4 and 24 h after surgery (p = 0.024 and p = 0.000, respectively). MPO levels were found to be increased in the CPB patients when compared to those patients who did not undergo CPB. However, the difference between the groups was not statistically significant.
  
  
  CONCLUSIONS
  Our data show that CPB induced a rise in NP and CRP levels.
authors.affiliation: Department of Biochemistry, Mersin University Faculty of Medicine, Mersin, Turkey. lokmanayaz@yahoo.com
authors.forename: Lokman
authors.initials: L
authors.lastname: Ayaz
authors.forename: Ali
authors.initials: A
authors.lastname: Unlu
authors.forename: Nehir
authors.initials: N
authors.lastname: Sucu
authors.forename: Lulufer
authors.initials: L
authors.lastname: Tamer
authors.forename: Ugur
authors.initials: U
authors.lastname: Atik
authors.forename: Mehmet Ali
authors.initials: MA
authors.lastname: Sungur
mesh_terms: D000328:Adult; D000368:Aged; D015415:Biomarkers / Q000097:blood / Q000652:urine; D002097:C-Reactive Protein / Q000032:analysis*; D002315:Cardiopulmonary Bypass; D001026:Coronary Artery Bypass; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D019798:Neopterin / Q000097:blood* / Q000652:urine; D009195:Peroxidase / Q000097:blood*; D011446:Prospective Studies
chemical_list: D015415:Biomarkers; D019798:Neopterin; D002097:C-Reactive Protein; D009195:Peroxidase