title: The evaluations of frequency distribution heparin resistance during coronary artery bypass graft.
abstract: BACKGROUND
  Heparin is one of the most important medication that is used in coronary artery bypass graft (CABG) operations, but some patients demonstrate heparin resistance (HR) during CABG. Heparin resistance was defined as at least one activated clothing time <400 seconds after heparinization and/or the need for purified antithrombin III (AT-III) administration. The goal of this study was the investigation of HR prevalence in our country and relation between HR and post-operative CABG complications.
  
  
  METHODS
  One hundred patients that candidate for CABG were selected and surveyed for HR and complications. The data entered to computer and analyzed by SPSS soft ware. The Chi-square and student t-tests were used for data analysis.
  
  
  RESULTS
  The prevalence of heparin resistance in our study was 3%. There was no relation among bleeding, cardiac arrest and HR. Bleeding happened in 13 patients of which 1 person was in HR group (33.3%) and 12 in non HR group (12.4%) (P = 0.34). Cardiac arrest happened in 8 patients, 1 person was in HR group (33.3%) and 7 in non HR group (7.2%) (P = 0.22). According our data there were no relation among HR and gender and ventilator dependency time.
  
  
  CONCLUSIONS
  HR is a nearly prevalent complication among patients that undergone CABG that may led to some complications such as bleeding and cardiac arrest. In our study, we did not find significant relation among them, but in frequency these complications were higher in HR group.
authors.affiliation: Anesthesiology and Critical Care Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Kaivan
authors.initials: K
authors.lastname: Bagheri
authors.affiliation: Anesthesiology and Critical Care Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Azim
authors.initials: A
authors.lastname: Honarmand
authors.affiliation: Anesthesiology and Critical Care Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Mohammadreza
authors.initials: M
authors.lastname: Safavi
authors.affiliation: Anesthesiology and Critical Care Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Parviz
authors.initials: P
authors.lastname: Kashefi
authors.affiliation: Anesthesiology and Critical Care Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Lale
authors.initials: L
authors.lastname: Sayadi
authors.affiliation: Anesthesiology and Critical Care Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Leila
authors.initials: L
authors.lastname: Mohammadinia
keywords: Bleeding; coronary artery bypass graft; heparin; heparin complication; heparin resistance