title: Intraoperative hemodynamic assessment of gastroepiploic artery and saphenous vein bypass grafts: a comparative study.
abstract: OBJECTIVE
  Blood flow characteristics of right gastroepiploic artery and saphenous vein conduits were compared during bypass surgery.
  
  
  METHODS
  This study is based on a consecutive series of 97 patients undergoing a bypass graft to the right coronary artery, posterior descending artery, or posterolateral branch using either a pediculated right gastroepiploic artery (n = 52) or a saphenous vein (n = 45) bypass graft. Flows and velocity profiles were measured with an 8-MHz pulsed-wave Doppler ultrasound flowmeter. Thorough flow measurements were made (1) after cessation of cardiopulmonary bypass and (2) before chest closure.
  
  
  RESULTS
  At the end of cardiopulmonary bypass, flow in the right gastroepiploic artery (59. 0 +/- 6.7 mL/min) did not differ (P =.08) from flow in the saphenous vein (46.1 +/- 2.7 mL/min). Mean trace velocity was 11.9 +/- 0.7 cm/s in the right gastroepiploic artery and 11.6 +/- 0.8 cm/s in the saphenous vein (P =.80), but peak systolic velocity was 29.4 +/- 1.2 cm/s for the right gastroepiploic artery and 23.1 +/- 1.3 cm/s for the saphenous vein (P <.001). Likewise, before chest closure, flow was 57.1 +/- 4.7 mL/min in the right gastroepiploic artery and 46.5 +/- 4.0 mL/min in the saphenous vein (P =.10), mean velocity was 12. 9 +/- 0.7 and 11.6 +/- 0.8 cm/s, respectively (P = .22), and systolic peak velocity was 30.0 +/- 1.2 and 22.3 +/- 1.2 cm/s, respectively (P < .001).
  
  
  CONCLUSIONS
  There were no flow differences between right gastroepiploic artery and saphenous vein grafts implanted into the same coronary bed in comparable groups of patients. Waveform shape of the right gastroepiploic artery grafts was characterized by a wider spectral dispersion resulting in a higher maximal frequency.
authors.affiliation: Division of Cardiovascular and Thoracic Surgery, Université Hospital of Mont-Yvoir, Belgium.
authors.forename: Y A
authors.initials: YA
authors.lastname: Louagie
authors.forename: J
authors.initials: J
authors.lastname: Jamart
authors.forename: M
authors.initials: M
authors.lastname: Buche
authors.forename: P
authors.initials: P
authors.lastname: Eucher
authors.forename: P
authors.initials: P
authors.lastname: van San
authors.forename: S
authors.initials: S
authors.lastname: Theys
authors.forename: J C
authors.initials: JC
authors.lastname: Schoevaerdts
mesh_terms: D000368:Aged; D019917:Blood Vessel Prosthesis Implantation; D002315:Cardiopulmonary Bypass; D003327:Coronary Disease / Q000601:surgery; D003331:Coronary Vessels / Q000000981:diagnostic imaging / Q000601:surgery*; D005260:Female; D006439:Hemodynamics / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D016343:Monitoring, Intraoperative / Q000379:methods; D012212:Rheology; D012501:Saphenous Vein / Q000000981:diagnostic imaging / Q000502:physiology / Q000637:transplantation*; D013157:Splenic Artery / Q000000981:diagnostic imaging / Q000502:physiology / Q000637:transplantation*; D013270:Stomach / Q000098:blood supply; D018617:Ultrasonography, Doppler, Pulsed