title: [Analysis of blood flow in sequential and individual saphenous vein grafts in off-pump coronary artery bypass grafting].
abstract: OBJECTIVE
  To compare the blood flow in sequential and individual saphenous vein grafts (SVGs) and to analyze the influence of the location of the target vessel in off-pump coronary artery bypass grafting (OPCAB).
  
  
  METHODS
  A total of 464 SVGs in 412 patients receiving OPCAB were nested into individual SVG (n=206), double (n=241) or triple sequential SVG (n=15), and analyzed.
  
  
  RESULTS
  The blood flow in double and triple SVGs was significantly higher than in individual SVGs [(43.4±22.5), (43.7±19.2) and (28.9±18.7) mL/min, respectively, P<0.001, P=0.047]. There were no differences between flow in double and triple SVGs (P=0.96). Pulsatility index (PI) of the three groups were similar (2.6±1.2, 2.5±1.6, 2.8±0.9, respectively, P=0.49, P=0.49). In individual SVGs to right coronary artery, the blood flow was higher than in the posterior descending branch (PDA) (P=0.047) and posterior branch of left ventricle (PBLV), the flow-time in systole period was longer than diagonals (P=0.003), obtuse marginal (OM) (P=0.013) and PDA (P=0.002), PI was significantly lower than PDA (P=0.033) and PBLV (P=0.032). The blood flow in individual SVGs to diagonals was significantly lower than in other target vessels except for PBLV (P<0.05). Flow in double SVGs to PDA-PBLV was significantly lower than in PDA-OM.
  
  
  CONCLUSIONS
  The mean blood flow in double and triple sequential SVGs is about 1.5 times higher than in individual SVGs. Individual, double, and triple SVGs have similar pI. Flow in individual SVGs to diagonals was significantly lower than in other target vessels except for PBLV.
authors.affiliation: Department of Cardiovascular Surgery, General Hospital of the People's Liberation Army, Beijing, China.
authors.forename: Mingyan
authors.initials: M
authors.lastname: Wang
authors.forename: Changqing
authors.initials: C
authors.lastname: Gao
authors.forename: Bojun
authors.initials: B
authors.lastname: Li
authors.forename: Gang
authors.initials: G
authors.lastname: Wang
authors.forename: Cangsong
authors.initials: C
authors.lastname: Xiao
authors.forename: Yang
authors.initials: Y
authors.lastname: Wu
authors.forename: Chonglei
authors.initials: C
authors.lastname: Ren
authors.forename: Weihua
authors.initials: W
authors.lastname: Ye
authors.forename: Guopeng
authors.initials: G
authors.lastname: Liu
mesh_terms: D000328:Adult; D000368:Aged; D000789:Angina, Unstable / Q000601:surgery; D001783:Blood Flow Velocity; D047549:Coronary Artery Bypass, Off-Pump / Q000379:methods*; D003326:Coronary Circulation; D003327:Coronary Disease / Q000601:surgery; D005260:Female; D006085:Graft Survival; D006801:Humans; D008297:Male; D008323:Mammary Arteries / Q000637:transplantation; D008875:Middle Aged; D012501:Saphenous Vein / Q000503:physiopathology / Q000637:transplantation*