title: Physiologic assessment of jailed side branch lesions using fractional flow reserve.
abstract: OBJECTIVE
  This study was performed to evaluate the feasibility of the physiologic assessment of jailed side branches using fractional flow reserve (FFR) and to compare the measured FFR with the stenosis severity assessed by quantitative coronary angiography (QCA).
  
  
  BACKGROUND
  It is not well-known which side branches should be treated after stent implantation at main branches and how to assess the functional significance of these lesions.
  
  
  METHODS
  Ninety-seven jailed side branch lesions (vessel size > 2.0 mm, percent stenosis > 50% by visual estimation) after stent implantation at main branches were consecutively enrolled. The FFR was measured using a pressure wire at 5 mm distal and proximal to the ostial lesion of the jailed side branch.
  
  
  RESULTS
  The FFR measurement was successful in 94 lesions. Mean FFRs were 0.94 +/- 0.04 and 0.85 +/- 0.11 at the main branches and jailed side branches, respectively. There was a negative correlation between the percent stenosis and FFR (r = -0.41, p < 0.001). However, no lesion with < 75% stenosis had FFR < 0.75. Among 73 lesions with > or = 75% stenosis, only 20 lesions were functionally significant.
  
  
  CONCLUSIONS
  The FFR measurement in jailed side branch lesions is both safe and feasible. Quantitative coronary angiography is unreliable in the assessment of the functional severity of jailed side branch lesions, and measurement of FFR suggests that most of these lesions do not have functional significance.
authors.affiliation: Division of Cardiology, Department of Internal Medicine, Seoul National University College of Medicine, Cardiovascular Center and Cardiovascular Research Institute, Seoul National University Hospital, Seoul, Republic of Korea.
authors.forename: Bon-Kwon
authors.initials: BK
authors.lastname: Koo
authors.forename: Hyun-Jai
authors.initials: HJ
authors.lastname: Kang
authors.forename: Tae-Jin
authors.initials: TJ
authors.lastname: Youn
authors.forename: In-Ho
authors.initials: IH
authors.lastname: Chae
authors.forename: Dong-Joo
authors.initials: DJ
authors.lastname: Choi
authors.forename: Hyo-Soo
authors.initials: HS
authors.lastname: Kim
authors.forename: Dae-Won
authors.initials: DW
authors.lastname: Sohn
authors.forename: Byung-Hee
authors.initials: BH
authors.lastname: Oh
authors.forename: Myoung-Mook
authors.initials: MM
authors.lastname: Lee
authors.forename: Young-Bae
authors.initials: YB
authors.lastname: Park
authors.forename: Yun-Shik
authors.initials: YS
authors.lastname: Choi
authors.forename: Seung-Jae
authors.initials: SJ
authors.lastname: Tahk
mesh_terms: D001783:Blood Flow Velocity / Q000502:physiology*; D017023:Coronary Angiography / Q000295:instrumentation*; D003326:Coronary Circulation / Q000502:physiology*; D023921:Coronary Stenosis / Q000000981:diagnostic imaging / Q000503:physiopathology*; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018570:Risk Assessment; D015607:Stents