title: Fate of lesion-related side branches after coronary artery stenting.
abstract: OBJECTIVE
  The aim of this study was to assess the immediate and long-term patency of lesion-associated side branches after coronary artery stenting.
  
  
  BACKGROUND
  The possible adverse effects related to implantation of coronary stents are not completely known. An important potential complication of stenting is side branch occlusion due to mechanical obstruction or thrombosis.
  
  
  METHODS
  Serial coronary angiography was performed in 153 patients (167 lesions) at baseline, after conventional balloon angioplasty, immediately after Palmaz-Schatz stent placement and at 6 months. The patency of side branches, where present, was analyzed at each of these points.
  
  
  RESULTS
  Of 167 lesions stented, 57 stent placements spanned 66 side branches with a diameter > or = 1 mm. Twenty-seven (41%) of these side branches had > or = 50% ostial stenosis before standard balloon angioplasty. Six side branches became occluded after standard balloon angioplasty and remained occluded after stenting. Of the 60 side branches patent after conventional angioplasty, 57 (95%) remained patent immediately after stenting. All three side branches that became occluded after stenting had > or = 50% ostial stenosis at baseline. All 60 side branches, including the 3 initially occluded after stenting, were patent at 6-month follow-up.
  
  
  CONCLUSIONS
  These findings demonstrate that 1) acute side branch occlusion due to coronary stenting occurs infrequently; 2) when side branch occlusion occurs, it is associated with intrinsic ostial disease; and 3) the patency of side branch ostia is well maintained at long-term follow-up.
authors.affiliation: Department of Medicine, Jefferson Medical College, Philadelphia, Pennsylvania 19107.
authors.forename: D L
authors.initials: DL
authors.lastname: Fischman
authors.forename: M P
authors.initials: MP
authors.lastname: Savage
authors.forename: M B
authors.initials: MB
authors.lastname: Leon
authors.forename: R A
authors.initials: RA
authors.lastname: Schatz
authors.forename: S
authors.initials: S
authors.lastname: Ellis
authors.forename: M W
authors.initials: MW
authors.lastname: Cleman
authors.forename: J W
authors.initials: JW
authors.lastname: Hirshfeld
authors.forename: P
authors.initials: P
authors.lastname: Teirstein
authors.forename: S
authors.initials: S
authors.lastname: Bailey
authors.forename: C M
authors.initials: CM
authors.lastname: Walker
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016009:Chi-Square Distribution; D002932:Cineangiography; D003097:Collateral Circulation / Q000502:physiology*; D017023:Coronary Angiography; D003326:Coronary Circulation / Q000502:physiology*; D003327:Coronary Disease / Q000000981:diagnostic imaging / Q000209:etiology / Q000503:physiopathology* / Q000628:therapy*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015607:Stents / Q000009:adverse effects; D013997:Time Factors