title: Postoperative laboratory and imaging investigations in intensive care units following coronary artery bypass grafting: a comparison of two Canadian hospitals.
abstract: OBJECTIVE
  To compare the utilization and cost of common laboratory and imaging tests following admission to the intensive care unit (ICU) after coronary artery bypass surgery in two hospitals. The hospitals use different strategies to order tests postoperatively: one hospital uses a mandated protocol while the other does not.
  
  
  METHODS
  Demographic and testing data were prospectively collected in both hospitals as part of an ongoing ICU management program. Thirteen commonly performed laboratory tests or imaging procedures were compared. Average costs for each test were calculated, and utilization and cost of testing were compared per admission and per day in ICU.
  
  
  METHODS
  Two tertiary care ICUs in different Canadian cities.
  
  
  METHODS
  Consecutive patients admitted to ICU following coronary artery bypass graft surgery over a two-year period.
  
  
  RESULTS
  There were 415 admissions to the Health Sciences Centre in Winnipeg, Manitoba and 504 to the Jewish General Hospital (JGH) in Montreal, Quebec. There were no demographic, length of stay or ICU mortality differences. A postoperative protocol for ordering investigations is used at JGH. Striking differences in test utilization were noted, with more investigations performed per admission and per unit day at JGH (P < 0.001). The average cost of the investigations was greater at JGH ($160 more per admission; $75 more per intensive care day).
  
  
  CONCLUSIONS
  There are marked differences in the investigation pattern and costs for coronary artery bypass patients admitted to ICU in these hospitals. It is suggested that the benefits of frequent routine determinations of bloodwork, electrocardiograms and chest radiographs should be reevaluated in this patient population.
authors.affiliation: Department of Anesthesia, Health Sciences Centre, Winnipeg, Manitoba. deanbell@compuserve.com
authors.forename: D D
authors.initials: DD
authors.lastname: Bell
authors.forename: T
authors.initials: T
authors.lastname: Ostryzniuk
authors.forename: B
authors.initials: B
authors.lastname: Verhoff
authors.forename: A
authors.initials: A
authors.lastname: Spanier
authors.forename: D E
authors.initials: DE
authors.lastname: Roberts
mesh_terms: D002170:Canada; D016507:Cardiology Service, Hospital / Q000592:standards*; D001026:Coronary Artery Bypass / Q000191:economics; D003363:Cost Control; D003952:Diagnostic Imaging / Q000191:economics; D005260:Female; D006801:Humans; D007362:Intensive Care Units / Q000592:standards*; D008297:Male; D011182:Postoperative Care