title: The effect of the time interval between coronary angiography and on-pump cardiac surgery on risk of postoperative acute kidney injury: a meta-analysis.
abstract: BACKGROUND
  Reports of the association between the time interval from coronary angiography (CAG) to cardiac surgery and risk of postoperative acute kidney injury (AKI) are controversial. We attempted to examine this association by conducting a meta-analysis.
  
  
  METHODS
  We searched the Pubmed, MEDLINE, EMBASE, Web of Science databases, and the Cochrane Library from January 1966 to March 2013. A meta-analysis of studies reporting data for 1-day and 3-day time intervals between CAG and cardiac surgery was conducted after evaluation of heterogeneity and publication bias. Study-specific estimates were combined with inverse variance-weighted averages of logarithmic odds ratios (ORs) in fixed-effects models.
  
  
  RESULTS
  From 8 studies involving 11542 persons, the pooled OR of AKI associated with an interval of 1 day or less between CAG and surgery was 1.21 (95% confidence interval (CI), 1.04 to 1.39) relative to an interval of more than 1 day. From 4 studies involving 5420 persons in the cardiopulmonary-bypass subgroup, the pooled OR of AKI associated with an interval of 3 days or less between CAG and surgery was 1.25 (95% CI, 1.07 to 1.43) relative to an interval of more than 3 days. The adjusted OR of the study in the cardiopulmonary bypass/ deep hypothermic circulatory arrest subgroup was 0.35 (95% CI, 0.17 to 0.73).
  
  
  CONCLUSIONS
  A time interval of 1 day or less between CAG and on-pump cardiac surgery was significantly associated with increased risk of AKI. A delay of on-pump cardiac surgery until 24 hours after CAG can potentially decrease postoperative AKI.
authors.forename: Yijie
authors.initials: Y
authors.lastname: Hu
authors.forename: Zhiping
authors.initials: Z
authors.lastname: Li
authors.forename: Jianming
authors.initials: J
authors.lastname: Chen
authors.forename: Cheng
authors.initials: C
authors.lastname: Shen
authors.forename: Yi
authors.initials: Y
authors.lastname: Song
authors.forename: Qianjin
authors.initials: Q
authors.lastname: Zhong
mesh_terms: D058186:Acute Kidney Injury / Q000209:etiology*; D006348:Cardiac Surgical Procedures / Q000009:adverse effects*; D017023:Coronary Angiography / Q000009:adverse effects*; D005260:Female; D006801:Humans; D008297:Male; D016017:Odds Ratio; D011183:Postoperative Complications; D011184:Postoperative Period; D018570:Risk Assessment; D012307:Risk Factors; D013997:Time Factors
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