title: Preoperative coronary angiography within one day of valve surgery is not associated with postoperative acute kidney injury in patients with preserved renal function.
abstract: BACKGROUND
  Acute kidney injury (AKI) is a common complication after cardiac surgery. Associations between the time interval (TI) from preoperative coronary angiography (CAG) to cardiac surgery have been investigated, although with conflicting results.
  
  
  METHODS
  We evaluated data collected from a retrospective review of consecutive patients who underwent preoperative CAG and heart valve surgery at our institution between September 2008 and February 2013. A total of 426 patients met the study criteria. Patients were divided into two groups according to the length of time between preoperative CAG and valve surgery: within one day (group A) or longer than one day (group B). Logistic regression was applied to analyze the relationships between TI and postoperative AKI.
  
  
  RESULTS
  Of 426 patients, 140 (33%) underwent CAG on preoperative day 1, while 286 (67%) underwent CAG on preoperative day 2 or sooner. AKI occurred in 19 (13.6%) patients in group A and in 35 (12.2%) patients in group B (p = 0.70). CAG on preoperative day 1 was not associated an increased risk of AKI relative to CAG on preoperative day 2 or sooner (p = 0.49; odds ratio, 1.26; 95% CI, 0.66 to 2.41).
  
  
  CONCLUSIONS
  Preoperative CAG within one day of elective heart valve surgery is not associated with an increase in postoperative AKI in patients with normal renal function.
authors.affiliation: Division of Cardiovascular Surgery, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Yonsei University Health System, Seoul, Republic of Korea.
authors.forename: Seungjun
authors.initials: S
authors.lastname: Song
authors.forename: Seung Hyun
authors.initials: SH
authors.lastname: Lee
authors.forename: Hyung Chae
authors.initials: HC
authors.lastname: Lee
authors.forename: Young-Nam
authors.initials: YN
authors.lastname: Youn
authors.forename: Byung-Chul
authors.initials: BC
authors.lastname: Chang
authors.forename: Kyung-Jong
authors.initials: KJ
authors.lastname: Yoo
authors.forename: Jong Gun
authors.initials: JG
authors.lastname: Kim
authors.forename: Sak
authors.initials: S
authors.lastname: Lee
mesh_terms: D058186:Acute Kidney Injury / Q000453:epidemiology* / Q000209:etiology*; D000368:Aged; D006348:Cardiac Surgical Procedures; D017023:Coronary Angiography / Q000009:adverse effects*; D017558:Elective Surgical Procedures; D005260:Female; D006351:Heart Valves / Q000601:surgery*; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000453:epidemiology* / Q000209:etiology*; D057234:Preoperative Period; D012189:Retrospective Studies; D012306:Risk; D013997:Time Factors