title: Postoperative acute kidney injury defined by RIFLE criteria predicts early health outcome and long-term survival in patients undergoing redo coronary artery bypass graft surgery.
abstract: OBJECTIVE
  To investigate the impact of postoperative acute kidney injury (AKI) on early health outcome and on long-term survival in patients undergoing redo coronary artery bypass grafting (CABG).
  
  
  METHODS
  We performed a Cox analysis with 398 consecutive patients undergoing redo CABG over a median follow-up of 7 years (interquartile range, 4-12.2 years). Renal function was assessed using baseline and peak postoperative levels of serum creatinine. AKI was defined according to the risk, injury, failure, loss, and end-stage (RIFLE) criteria. Health outcome measures included the rate of in-hospital AKI and all-cause 30-day and long-term mortality, using data from the United Kingdom's Office of National Statistics. Propensity score matching, as well as logistic regression analyses, were used. The impact of postoperative AKI at different time points was related to survival.
  
  
  RESULTS
  In patients with redo CABG, the occurrence of postoperative AKI was associated with in-hospital mortality (odds ratio [OR], 3.74; 95% confidence interval [CI], -1.3 to 10.5; P < .01], high Euroscore (OR, 1.27; 95% CI, 1.07-1.52; P < .01), use of IABP (OR, 6.9; 95% CI, 2.24-20.3; P < .01), and reduced long-term survival (hazard ratio [HR], 2.42; 95% CI, 1.63-3.6; P = .01). Overall survival at 5 and 10 years was lower in AKI patients with AKI compared with those without AKI (64% vs 85% at 5 years; 51% vs 68% at 10 years). On 1:1 propensity score matching analysis, postoperative AKI was independently associated with reduced long term survival (HR, 2.8; 95% CI, 1.15-6.7).
  
  
  CONCLUSIONS
  In patients undergoing redo CABG, the occurrence of postoperative AKI is associated with increased 30-day mortality and major complications and with reduced long-term survival.
authors.affiliation: Bristol Heart Institute, Bristol Cardiovascular, University of Bristol and University Hospital Bristol National Health System Foundation Trust, Bristol, United Kingdom.
authors.forename: Mustafa
authors.initials: M
authors.lastname: Zakkar
authors.affiliation: Bristol Heart Institute, Bristol Cardiovascular, University of Bristol and University Hospital Bristol National Health System Foundation Trust, Bristol, United Kingdom.
authors.forename: Vito D
authors.initials: VD
authors.lastname: Bruno
authors.affiliation: Bristol Heart Institute, Bristol Cardiovascular, University of Bristol and University Hospital Bristol National Health System Foundation Trust, Bristol, United Kingdom.
authors.forename: Gustavo
authors.initials: G
authors.lastname: Guida
authors.affiliation: Bristol Heart Institute, Bristol Cardiovascular, University of Bristol and University Hospital Bristol National Health System Foundation Trust, Bristol, United Kingdom.
authors.forename: Gianni D
authors.initials: GD
authors.lastname: Angelini
authors.affiliation: Bristol Heart Institute, Bristol Cardiovascular, University of Bristol and University Hospital Bristol National Health System Foundation Trust, Bristol, United Kingdom.
authors.forename: Pierpaulo
authors.initials: P
authors.lastname: Chivasso
authors.affiliation: Bristol Heart Institute, Bristol Cardiovascular, University of Bristol and University Hospital Bristol National Health System Foundation Trust, Bristol, United Kingdom.
authors.forename: M Sadeeh
authors.initials: MS
authors.lastname: Suleiman
authors.affiliation: Bristol Heart Institute, Bristol Cardiovascular, University of Bristol and University Hospital Bristol National Health System Foundation Trust, Bristol, United Kingdom.
authors.forename: Alan J
authors.initials: AJ
authors.lastname: Bryan
authors.affiliation: Bristol Heart Institute, Bristol Cardiovascular, University of Bristol and University Hospital Bristol National Health System Foundation Trust, Bristol, United Kingdom. Electronic address: R.Ascione@bristol.ac.uk.
authors.forename: Raimondo
authors.initials: R
authors.lastname: Ascione
mesh_terms: D058186:Acute Kidney Injury / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology*; D000368:Aged; D001026:Coronary Artery Bypass / Q000009:adverse effects*; D003324:Coronary Artery Disease / Q000601:surgery*; D005260:Female; D005544:Forecasting; D005919:Glomerular Filtration Rate / Q000502:physiology*; D017052:Hospital Mortality / Q000639:trends; D006801:Humans; D015994:Incidence; D053208:Kaplan-Meier Estimate; D008297:Male; D016017:Odds Ratio; D011183:Postoperative Complications / Q000453:epidemiology*; D057216:Propensity Score; D012189:Retrospective Studies; D012307:Risk Factors; D015996:Survival Rate / Q000639:trends; D006113:United Kingdom / Q000453:epidemiology
keywords: coronary surgery; long-term survival; redo surgery; renal failure