title: Comparing the effectiveness of neutrophil-lymphocyte ratio as a mortality predictor on middle and advanced age coronary artery bypass graft patients.
abstract: OBJECTIVE
  In this study, the effect of neutrophil-lymphocyte ratio (NLR), which is a recently developed inflammatory parameter, as an early stage mortality predictive marker on coronary artery bypass (CABG) patients of various age groups was examined.
  
  
  METHODS
  Seventy eight patients under the age of 45 (Group 1) and 80 patients who were older than 45 (Group 2) randomly chosen from the patients who underwent isolated CABG surgery, were examined. The preoperative characteristics and NLRs were noted. The primary end point of the study was determined as all-cause in- hospital mortality.
  
  
  RESULTS
  Mortality was observed in 2 patients in Group 1 and 11 patients in Group 2. The threshold value of NLR was 2,47 in the Receiver Operating Characteristic (ROC) curve in Group 1 and there wasn't any significant correlation between preoperative NLR and mortality rates in the patients whose NLRs were above this curve. The threshold value was determined as 4.07 in Group 2 and there was a significant relation between preoperative NLR and mortality (p<0,01). No relation was found between NLR and mortality when all the examined patients were considered (p>0.05).
  
  
  CONCLUSIONS
  NLR that can be easily calculated, can be used as a mortality predictor in the patients of advanced age who will undergo isolated CABG procedure.
authors.affiliation: Department of Cardiovascular Surgery, Bursa Yuksek Ihtisas Education and Research Hospital, Bursa, Turkey.
authors.forename: Derih
authors.initials: D
authors.lastname: Ay
authors.affiliation: Department of Cardiovascular Surgery, Bursa Yuksek Ihtisas Education and Research Hospital, Bursa, Turkey.
authors.forename: Burak
authors.initials: B
authors.lastname: Erdolu
authors.affiliation: Department of Cardiovascular Surgery, Namik Kemal Univercity, Medical Faculty, Tekirdag, Turkey.
authors.forename: Gunduz
authors.initials: G
authors.lastname: Yumun
authors.affiliation: Department of Cardiovascular Surgery, Bursa Yuksek Ihtisas Education and Research Hospital, Bursa, Turkey.
authors.forename: Ufuk
authors.initials: U
authors.lastname: Aydin
authors.affiliation: Department of Cardiovascular Surgery, Yalova State Hospital, Yalova, Turkey.
authors.forename: Ahmet
authors.initials: A
authors.lastname: Demir
authors.affiliation: Department of Cardiovascular Surgery, Bahcesehir Univercity, Medical Faculty, Medical Park Hospital, Bursa, Turkey.
authors.forename: Osman
authors.initials: O
authors.lastname: Tiryakioglu
authors.affiliation: Department of Cardiovascular Surgery, Bursa Yuksek Ihtisas Education and Research Hospital, Bursa, Turkey.
authors.forename: Ahmet Hakan
authors.initials: AH
authors.lastname: Vural
keywords: Biological markers; coronary artery disease; inflammation; prognosis