title: Reference chart derived from post-stent-implantation intravascular ultrasound predictors of 6-month expected restenosis on quantitative coronary angiography.
abstract: BACKGROUND
  Intravascular ultrasound (IVUS)-guided stent implantation and the availability of a reference chart to predict the expected in-stent restenosis rate based on operator-dependent IVUS parameters may interactively facilitate optimal stent placement. The use of IVUS guidance protects against undue risks of dissection or rupture.
  
  
  RESULTS
  IVUS-determined post-stent-implantation predictors of 6-month in-stent restenosis on quantitative coronary angiography (QCA) were identified by logistic regression analysis. These predictors were used to construct a reference chart that predicts the expected 6-month QCA restenosis rate. IVUS and QCA data were obtained from 3 registries (MUSIC [Multicenter Ultrasound Stenting in Coronaries study], WEST-II [West European Stent Trial II], and ESSEX [European Scimed Stent EXperience]) and 2 randomized in-stent restenosis trials (ERASER [Evaluation of ReoPro And Stenting to Eliminate Restenosis] and TRAPIST [TRApidil vs placebo to Prevent In-STent intimal hyperplasia]). In-stent restenosis was defined as luminal diameter stenosis >50% by QCA. IVUS predictors were minimum and mean in-stent area, stent length, and in-stent diameter. Multiple models were constructed with multivariate logistic regression analysis. The model containing minimum in-stent area and stent length best fit the Hosmer-Lemeshow goodness-of-fit test. This model was used to construct a reference chart to calculate the expected 6-month restenosis rate.
  
  
  CONCLUSIONS
  The expected 6-month in-stent restenosis rate after stent implantation for short lesions in relatively large vessels can be predicted by use of in-stent minimal area (which is inversely related to restenosis) and stent length (which is directly related to restenosis), both of which can be read from a simple reference chart.
authors.affiliation: University Hospital Rotterdam-Dijkzigt, Rotterdam, Netherlands.
authors.forename: P J
authors.initials: PJ
authors.lastname: de Feyter
authors.forename: P
authors.initials: P
authors.lastname: Kay
authors.forename: C
authors.initials: C
authors.lastname: Disco
authors.forename: P W
authors.initials: PW
authors.lastname: Serruys
mesh_terms: D002986:Clinical Trials as Topic; D017023:Coronary Angiography / Q000592:standards*; D003327:Coronary Disease / Q000150:complications / Q000000981:diagnostic imaging / Q000601:surgery; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008955:Models, Cardiovascular; D012008:Recurrence; D012016:Reference Values; D012042:Registries; D015607:Stents / Q000592:standards*; D018084:Ultrasonography, Interventional / Q000592:standards*