title: The impact of intraoperative transit time flow measurement on the results of on-pump coronary surgery.
abstract: OBJECTIVE
  The purpose of this study is to evaluate the effect of detection of graft dysfunction by intraoperative transit time flow measurement (TTFM) on the surgical results of on-pump coronary artery bypass grafting.
  
  
  METHODS
  Two hundred patients undergoing on-pump isolate coronary artery bypass grafting via median sternotomy performed by the same surgical team were included into the study. TTFM was routinely performed for assessment of graft patency during operation after a transit time flow meter became available in our center in February 2006. The last 100 consecutive patients before this date formed the control group (Group A), and the first 100 consecutive patients after this date formed the study group (Group B). Interpretation of the values obtained using the TTFM in Group B patients has allowed us to reach a decision whether or not to revise a graft. Preoperative and postoperative variables of the two groups were compared.
  
  
  RESULTS
  The clinical features of control and study groups were comparable. We assessed patency of 303 grafts using TTFM. Revision was required for nine grafts in nine patients based on unsatisfactory TTFM findings. Incidences of overall mortality (p<0.05), peri- or postoperative myocardial infarction (p<0.05) and intraaortic balloon pump insertion (p<0.05) were significantly lower in Group B than Group A.
  
  
  CONCLUSIONS
  We believe that TTFM seems to be a crucial tool for deciding if a graft is well-functioning or not, and it allows for improvement of graft failure during operation. Our results suggest that detection of graft dysfunction intraoperatively by TTFM improves the surgical outcome.
authors.affiliation: Department of Cardiovascular Surgery, Ataturk University School of Medicine, Erzurum, Turkey. necipbecit@hotmail.com
authors.forename: Necip
authors.initials: N
authors.lastname: Becit
authors.forename: Bilgehan
authors.initials: B
authors.lastname: Erkut
authors.forename: Munacettin
authors.initials: M
authors.lastname: Ceviz
authors.forename: Yahya
authors.initials: Y
authors.lastname: Unlu
authors.forename: Abdurrahim
authors.initials: A
authors.lastname: Colak
authors.forename: Hikmet
authors.initials: H
authors.lastname: Kocak
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000714:Anastomosis, Surgical / Q000379:methods; D001783:Blood Flow Velocity / Q000502:physiology; D001026:Coronary Artery Bypass / Q000379:methods*; D003324:Coronary Artery Disease / Q000503:physiopathology / Q000601:surgery; D003326:Coronary Circulation; D003331:Coronary Vessels / Q000601:surgery; D005260:Female; D006801:Humans; D007387:Internal Mammary-Coronary Artery Anastomosis / Q000379:methods; D008297:Male; D008323:Mammary Arteries / Q000601:surgery; D008875:Middle Aged; D016343:Monitoring, Intraoperative / Q000379:methods*; D011183:Postoperative Complications; D017534:Radial Artery / Q000601:surgery; D012501:Saphenous Vein / Q000601:surgery; D016896:Treatment Outcome