title: [Incidence and risk factors of acute kidney injury post off-pump and on-pump coronary artery bypass grafting].
abstract: OBJECTIVE
  To investigate the incidence and risk factors of acute kidney injury (AKI) within the first postoperative week after off-pump or on-pump coronary artery bypass (OPCAB or CCAB) surgery.
  
  
  METHODS
  Consecutive patients underwent CABG between January 1990 and August 2006 in our institution and had normal serum creatinine (Scr) and estimated creatinine clearance (Ccr) values before operation were retrospectively analyzed. Multivariate logistic regression analysis was performed to identify risk factors for the development of AKI defined as Scr 130 - 199 micromol/L or Ccr 30 - 60 mlxmin(-1)x1.73 m(-2).
  
  
  RESULTS
  Incidence of AKI was significantly higher in patients underwent CCAB compared to those underwent OPCAB (63/331 vs. 61/518, P < 0.01). Peak Scr value was seen at 12th hour post OPCAB and 24th hour post CCAB, respectively. The rapid recovering of Scr occurred between 24th hour to 48th hour in patients underwent OPCAB and 48th hour to 72th hour in patients underwent CCAB surgery. Multivariate forward stepwise logistic regression analysis showed that LVEF < 30%, pulse pressure >/= 60 mm Hg (1 mm Hg = 0.133 kPa), peripheral vascular disease, diabetes, emergent procedure, triple-vessel disease, higher body mass index (kg/m(2)), intraoperative and postoperative IABP, NYHA class III or IV and cardiopulmonary bypass were risk factors for the development of postoperative AKI following CABG, while LVEF > 50% and intraoperative and postoperative IABP were associated with lower incidence of AKI (OR < 1).
  
  
  CONCLUSIONS
  AKI is not a rare complication post OPCAB or CCAB surgery, especially in patients with reduced LVEF, increased pulse pressure, peripheral vascular disease, diabetes, emergent procedure, triple-vessel disease, higher body mass index, intraoperative and postoperative IABP.
authors.affiliation: Department of Cardiac Surgery, First Affiliated Hospital of China Medical University, Shenyang 110001, China.
authors.forename: Tian-xiang
authors.initials: TX
authors.lastname: GU
authors.forename: Wen-feng
authors.initials: WF
authors.lastname: ZHANG
authors.forename: Zong-yi
authors.initials: ZY
authors.lastname: XIU
authors.forename: Qin
authors.initials: Q
authors.lastname: FANG
authors.forename: Yu-hai
authors.initials: YH
authors.lastname: ZHANG
authors.forename: Chun
authors.initials: C
authors.lastname: WANG
mesh_terms: D058186:Acute Kidney Injury / Q000209:etiology*; D000368:Aged; D002315:Cardiopulmonary Bypass / Q000009:adverse effects*; D001026:Coronary Artery Bypass / Q000009:adverse effects; D047549:Coronary Artery Bypass, Off-Pump / Q000009:adverse effects*; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012307:Risk Factors