title: Frequency and clinical consequences associated with sidebranch occlusion during stent implantation using zotarolimus-eluting and paclitaxel-eluting coronary stents.
abstract: BACKGROUND
  Myocardial infarction (MI) after drug-eluting stent placement has been associated with an unfavorable late prognosis. Although the etiology of periprocedural MI is multifactorial, sidebranch occlusion may be an important contributing factor. We sought to identify the incidence of sidebranch occlusion during zotarolimus-eluting stent (ZES) and paclitaxel-eluting stent (PES) placement and to relate sidebranch occlusion to the occurrence of periprocedural MI.
  
  
  RESULTS
  Angiograms were reviewed from patients randomly assigned to treatment with a ZES (597 patients; 943 sidebranches) or a PES (619 patients; 977 sidebranches). Sidebranch occlusion was defined as Thrombolysis in Myocardial Infarction flow grade 0 or 1. Sidebranch occlusion was correlated with frequency of MI, as assessed by the creatine phosphokinase MB isoenzyme. Sidebranch occlusion occurred less often after the first stent deployment in patients treated with ZES (2.2%) than in patients treated with PES (4.0%; P=0.032). A similar reduction in the frequency of sidebranch occlusion at any point during the procedure was found in patients treated with ZES (2.9% versus 4.8% in PES patients; P=0.042). Multivariable predictors of sidebranch occlusion included baseline sidebranch stenosis, complex lesion morphology, smaller baseline minimal lumen diameters, and the use of a PES. Of the 20 patients with MI within 30 days of the procedure, 30% had evidence of sidebranch occlusion during the stent procedure.
  
  
  CONCLUSIONS
  Patients treated with ZES were less likely to develop sidebranch occlusion during stent placement than patients treated with PES. Less frequent sidebranch occlusion with ZES may have contributed to the lower frequency rates of periprocedural MI in this study.
authors.affiliation: Department of Internal Medicine, Cardiology Division, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA. jpopma@bidmc.harvard.edu
authors.forename: Jeffrey J
authors.initials: JJ
authors.lastname: Popma
authors.forename: Laura
authors.initials: L
authors.lastname: Mauri
authors.forename: Charles
authors.initials: C
authors.lastname: O'Shaughnessy
authors.forename: Paul
authors.initials: P
authors.lastname: Overlie
authors.forename: Brent
authors.initials: B
authors.lastname: McLaurin
authors.forename: Alexandra
authors.initials: A
authors.lastname: Almonacid
authors.forename: Ajay
authors.initials: A
authors.lastname: Kirtane
authors.forename: Martin B
authors.initials: MB
authors.lastname: Leon
mesh_terms: D000368:Aged; D015906:Angioplasty, Balloon, Coronary / Q000009:adverse effects* / Q000295:instrumentation* / Q000401:mortality; D015415:Biomarkers / Q000097:blood; D002317:Cardiovascular Agents / Q000008:administration & dosage*; D017023:Coronary Angiography; D003324:Coronary Artery Disease / Q000000981:diagnostic imaging / Q000401:mortality / Q000628:therapy*; D054059:Coronary Occlusion / Q000000981:diagnostic imaging / Q000209:etiology* / Q000401:mortality / Q000473:pathology; D052279:Creatine Kinase, MB Form / Q000097:blood; D054855:Drug-Eluting Stents; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015337:Multicenter Studies as Topic; D009203:Myocardial Infarction / Q000000981:diagnostic imaging / Q000209:etiology* / Q000401:mortality / Q000473:pathology; D009206:Myocardium / Q000473:pathology; D009336:Necrosis; D017239:Paclitaxel / Q000008:administration & dosage*; D016032:Randomized Controlled Trials as Topic; D012189:Retrospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D020123:Sirolimus / Q000008:administration & dosage / Q000031:analogs & derivatives*; D013997:Time Factors; D016896:Treatment Outcome
chemical_list: D015415:Biomarkers; D002317:Cardiovascular Agents; D052279:Creatine Kinase, MB Form; C489443:zotarolimus; D017239:Paclitaxel; D020123:Sirolimus