title: Multivariate predictors of intravascular ultrasound end points after directional coronary atherectomy.
abstract: OBJECTIVE
  This study attempted to identify the clinical, angiographic, procedural and intravascular ultrasound predictors of directional atherectomy results assessed by intravascular ultrasound.
  
  
  BACKGROUND
  Several angiographic and intravascular ultrasound variables have been associated with the outcome of directional coronary atherectomy. No study has incorporated both modalities into a predictive model.
  
  
  METHODS
  One hundred seventy patients were analyzed using preintervention and postintervention intravascular ultrasound and quantitative angiography. Clinical and procedural variables were collected by independent chart review. Quantitative and qualitative angiographic analysis was performed by a core laboratory in blinded manner. Intravascular ultrasound was performed using a transducer-tipped catheter, rotating within a stationary imaging sheath, and withdrawn automatically at 0.5 mm/s. Clinical, procedural, angiographic and ultrasound variables were tested in a multivariate linear regression model. Dependent ultrasound variables included postatherectomy lumen cross-sectional area and percent cross-sectional narrowing (plaque plus media/external elastic membrane cross-sectional area) and, in a subgroup of 47 patients studied using volumetric analysis, percent plaque volume removal.
  
  
  RESULTS
  By multivariate stepwise linear regression analysis, predictors of residual lumen cross-sectional area (correcting for reference lumen area) included arc of calcium and preatherectomy plaque plus media cross-sectional area; predictors of residual cross-sectional narrowing were arc of calcium, preatherectomy plaque plus media cross-sectional area and lesion length; and predictors of percent plaque volume removal were arc of calcium and atherectomy device size.
  
  
  CONCLUSIONS
  The preintervention lesion arc of calcium measured by intravascular ultrasound is the most consistent predictor of the effectiveness and results of directional coronary atherectomy.
authors: Intravascular Ultrasound Imaging Laboratory, Washington Hospital Center, Washington, D.C.
authors: F A
authors: FA
authors: Matar
authors: G S
authors: GS
authors: Mintz
authors: E
authors: E
authors: Pinnow
authors: S P
authors: SP
authors: Javier
authors: J J
authors: JJ
authors: Popma
authors: K M
authors: KM
authors: Kent
authors: L F
authors: LF
authors: Satler
authors: A D
authors: AD
authors: Pichard
authors: M B
authors: MB
authors: Leon
mesh_terms: D017225:Atherectomy, Coronary; D017023:Coronary Angiography / Q000379:methods; D003324:Coronary Artery Disease / Q000000981:diagnostic imaging* / Q000601:surgery*; D003331:Coronary Vessels / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D016896:Treatment Outcome; D018084:Ultrasonography, Interventional