title: Impact of kissing balloon inflation on the main vessel stent volume, area, and symmetry after side-branch dilation in patients with coronary bifurcation lesions: a serial volumetric intravascular ultrasound study.
abstract: OBJECTIVE
  Intravascular ultrasound (IVUS) was performed to investigate the impact of kissing balloon inflation (KBI) on the main vessel (MV) stent volume, area, and symmetry after side-branch (SB) dilation in patients with coronary bifurcation lesions (CBL).
  
  
  BACKGROUND
  It remains controversial whether KBI would restore the MV stent area and symmetry loss after SB dilation.
  
  
  METHODS
  A total of 88 serial IVUS examinations of the MV were performed after MV angioplasty, MV stenting, SB dilation, and KBI in 22 patients with CBL. The MV stent was divided into proximal, bifurcation, and distal segments; the stent volume index (SVI), minimal stent area (MSA), stent symmetry index (SSI), and external elastic membrane (EEM) volume index were measured in 198 stent segments and compared after MV stenting, SB dilation, and KBI.
  
  
  RESULTS
  In the bifurcation segment, SVI, MSA, and SSI were significantly smaller after SB dilation than after MV stenting and KBI (SVI was 6.10 ± 1.50 mm(3)/mm vs. 6.68 ± 1.60 mm(3)/mm and 6.57 ± 1.60 mm(3)/mm, respectively, p < 0.05; MSA was 5.15 ± 1.30 mm(2) vs. 6.08 ± 1.40 mm(2) and 5.86 ± 1.50 mm(2), respectively, p < 0.05; and SSI was 0.78 ± 0.02 mm(2) vs. 0.87 ± 0.03 mm(2) and 0.84 ± 0.03 mm(2), respectively, p < 0.05). KBI restored the MV SVI, MSA, and SSI after SB dilation. In the proximal segment, SVI, MSA, and EEM volume index were significantly larger, but SSI was smaller after KBI than after MV stenting and SB dilation. In the distal segment, neither SB dilation nor KBI had a significant impact on the MV stent volume or symmetry.
  
  
  CONCLUSIONS
  This is the first comprehensive volumetric IVUS analysis of CBL, to our knowledge, demonstrating that KBI restores the MV stent volume, area, and symmetry loss after SB dilation in the bifurcation segment, and induces asymmetric stent expansion in the proximal segment.
authors: Division of Cardiology, University of Cincinnati College of Medicine, Cincinnati, Ohio.
authors: Shahid
authors: S
authors: Rahman
authors: Tara
authors: T
authors: Leesar
authors: Mehmet
authors: M
authors: Cilingiroglu
authors: Mohamed
authors: M
authors: Effat
authors: Imran
authors: I
authors: Arif
authors: Tarek
authors: T
authors: Helmy
authors: Massoud A
authors: MA
authors: Leesar
mesh_terms: D000368:Aged; D015906:Angioplasty, Balloon, Coronary / Q000009:adverse effects / Q000295:instrumentation*; D017023:Coronary Angiography; D003324:Coronary Artery Disease / Q000000981:diagnostic imaging* / Q000628:therapy*; D003331:Coronary Vessels / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011474:Prosthesis Design; D015607:Stents; D013997:Time Factors; D016896:Treatment Outcome; D018084:Ultrasonography, Interventional
keywords: CBL; DES; EEM; EES; ISA; IVUS; KBI; MLD; MSA; MV; P&M; PCI; POT; QCA; RD; SB; SES; SSI; SVI; bifurcation lesions; coronary bifurcation lesions; drug-eluting stent(s); everolimus-eluting stent(s); external elastic membrane; incomplete stent apposition; intravascular ultrasound; kissing balloon inflation; kissing balloon inflation(s); main vessel; minimal lumen diameter; minimal stent area; percutaneous coronary intervention; plaque plus media; proximal optimization treatment; quantitative coronary angiography; reference diameter; side branch; sirolimus-eluting stent(s); stent symmetry index; stent volume index; stenting