title: In-hospital and nine-month outcomes among patients with coronary lesions involving a side branch and treated with bare metal stents.
abstract: BACKGROUND
  The optimal management of coronary lesions involving side branches is not known. New devices are being developed for dedicated bifurcation stenting or improved side branch access or protection. Several of these devices are bare-metal stent (BMS) platforms. The risk of side branch compromise and outcome after standard BMS is not known.
  
  
  METHODS
  We evaluated the frequency of side branch involvement and the rate of side branch compromise in a retrospective analysis of 1,440 patients from three pooled historical BMS clinical trials. The impact of side branch compromise on in-hospital and nine-month clinical outcomes was assessed.
  
  
  RESULTS
  Side branches >2 mm in diameter were present within the stented segment in 39% of treated lesions. Compromise of a side branch occurred in 27% of 1,440 lesions, including 22% of side branches that were not diseased prior to stenting. Compromise was associated with increased in-hospital MI (13.5% vs. 7.6%, P = 0.001), a trend for increased nine-month clinically driven target vessel revascularization (TVR, 17.4% vs. 13.2%, P = 0.058), and increased nine-month target vessel failure (composite of cardiac death, target vessel MI or TVR, 29.7% vs. 20.2%, P < 0.001).
  
  
  CONCLUSIONS
  At least moderate-sized side branches are involved frequently in lesions enrolled in routine clinical trials. Unexpected compromise of these side branches is common and is associated with increased in-hospital and nine-month adverse outcomes.
authors.affiliation: Harvard Clinical Research Institute, Boston, Massachusetts, USA.
authors.forename: Victor
authors.initials: V
authors.lastname: Novack
authors.forename: Lisa
authors.initials: L
authors.lastname: Battaglia
authors.forename: Jeffrey J
authors.initials: JJ
authors.lastname: Popma
authors.forename: Donald E
authors.initials: DE
authors.lastname: Cutlip
mesh_terms: D000368:Aged; D015906:Angioplasty, Balloon, Coronary / Q000009:adverse effects / Q000295:instrumentation* / Q000401:mortality; D017023:Coronary Angiography; D003324:Coronary Artery Disease / Q000000981:diagnostic imaging / Q000401:mortality / Q000628:therapy*; D005260:Female; D006801:Humans; D007297:Inpatients / Q000706:statistics & numerical data; D016015:Logistic Models; D008297:Male; D008670:Metals; D008875:Middle Aged; D009203:Myocardial Infarction / Q000209:etiology; D016016:Proportional Hazards Models; D011474:Prosthesis Design; D016032:Randomized Controlled Trials as Topic; D012189:Retrospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D015607:Stents; D013997:Time Factors; D016896:Treatment Outcome
chemical_list: D008670:Metals