title: The acute changes of fractional flow reserve in DK (double kissing), crush, and 1-stent technique for true bifurcation lesions.
abstract: BACKGROUND
  While many studies confirmed the importance of fractional flow reserve (FFR) in guiding complex percutaneous coronary interventions (PCI), data regarding the significance of FFR for bifurcation lesions are still lacking.
  
  
  METHODS
  Between October 2008 and October 2009, 51 patients with true bifurcation lesions were consecutively enrolled and randomized into double kissing (DK) crush (n = 25), and provisional 1-stent (n = 26) groups. FFR measurements at baseline and hyperemia were measured at pre-PCI, post-PCI, and at 8-month follow-up.
  
  
  RESULTS
  Clinical follow-ups were available in 100% of patients while only 33% of patients underwent angiographic follow-up. Baseline clinical and angiographic characteristics were matched between the 2 groups. Pre-PCI FFR of the main branch (MB) in the DK group was 0.76 +/- 0.15, which was significantly lower than in the provisional 1-stent group (0.83 +/- 0.10, P = 0.029). This difference disappeared after the PCI procedure (0.92 +/- 0.04 vs. 0.92 +/- 0.05, P = 0.58). There were no significant differences in terms of baseline, angiographic, procedural indexes, and FFR of side branch (SB) between the 2 treatment arms. However, immediately after PCI, the patient with DK crush had higher FFR in the SB as compared to the provisional 1-stent group (0.94 +/- 0.03 vs. 0.90 +/- 0.08, P = 0.028, respectively) and also they had lower diameter stenosis (8.59 +/- 6.41% vs. 15.62 +/- 11.69%, P = 0.015, respectively).
  
  
  CONCLUSIONS
  In the acute phase, immediately after PCI for bifurcation lesion, DK crush stenting was associated with higher FFR and lower residual diameter stenosis in the SB, as compared with the provisional 1-stent group.
authors.affiliation: Cardiological Department, Nanjing First Hospital, Nanjing Medical University, Nanjing, Jiangsu, China.
authors.forename: Fei
authors.initials: F
authors.lastname: Ye
authors.forename: Jun-Jie
authors.initials: JJ
authors.lastname: Zhang
authors.forename: Nai-Liang
authors.initials: NL
authors.lastname: Tian
authors.forename: Song
authors.initials: S
authors.lastname: Lin
authors.forename: Zhi-Zhong
authors.initials: ZZ
authors.lastname: Liu
authors.forename: Jing
authors.initials: J
authors.lastname: Kan
authors.forename: Hai-Mei
authors.initials: HM
authors.lastname: Xu
authors.forename: Zhongsheng
authors.initials: Z
authors.lastname: Zhu
authors.forename: Shao-Liang
authors.initials: SL
authors.lastname: Chen
mesh_terms: D015906:Angioplasty, Balloon, Coronary; D017023:Coronary Angiography; D003324:Coronary Artery Disease / Q000000981:diagnostic imaging / Q000628:therapy*; D023921:Coronary Stenosis / Q000000981:diagnostic imaging / Q000628:therapy*; D005260:Female; D053805:Fractional Flow Reserve, Myocardial / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D015607:Stents