title: The impact of precise robotic lesion length measurement on stent length selection: ramifications for stent savings.
abstract: OBJECTIVE
  Coronary stent deployment outcomes can be negatively impacted by inaccurate lesion measurement and inappropriate stent length selection (SLS). We compared visual estimate of these parameters to those provided by the CorPath 200® Robotic PCI System.
  
  
  METHODS
  Sixty consecutive patients who underwent coronary stent placement utilizing the CorPath System were evaluated. The treating physician assessed orthogonal images and provided visual estimates of lesion length and SLS. The robotic system was then used for the same measures. SLS was considered to be accurate when visual estimate and robotic measures were in agreement. Visual estimate SLSs were considered to be "short" or "long" if they were below or above the robotic-selected stents, respectively.
  
  
  RESULTS
  Only 35% (21/60) of visually estimated lesions resulted in accurate SLS, whereas 33% (20/60) and 32% (19/60) of the visually estimated SLSs were long and short, respectively. In 5 cases (8.3%), 1 less stent was placed based on the robotic lesion measurement being shorter than the visual estimate.
  
  
  CONCLUSIONS
  Visual estimate assessment of lesion length and SLS is highly variable with 65% of the cases being inaccurately measured when compared to objective measures obtained from the robotic system. The 32% of the cases where lesions were visually estimated to be short represents cases that often require the use of extra stents after the full lesion is not covered by 1 stent [longitudinal geographic miss (LGM)]. Further, these data showed that the use of the robotic system prevented the use of extra stents in 8.3% of the cases. Measurement of lesions with robotic PCI may reduce measurement errors, need for extra stents, and LGM.
authors.affiliation: Carolinas HealthCare System NorthEast, Concord, NC 28025. Electronic address: paul.campbell@carolinashealthcare.org.
authors.forename: Paul T
authors.initials: PT
authors.lastname: Campbell
authors.affiliation: Carolinas HealthCare System NorthEast, Concord, NC 28025.
authors.forename: Kevin R
authors.initials: KR
authors.lastname: Kruse
authors.affiliation: Carolinas HealthCare System NorthEast, Concord, NC 28025.
authors.forename: Christopher R
authors.initials: CR
authors.lastname: Kroll
authors.affiliation: Carolinas HealthCare System NorthEast, Concord, NC 28025.
authors.forename: Janet Y
authors.initials: JY
authors.lastname: Patterson
authors.affiliation: Carolinas HealthCare System NorthEast, Concord, NC 28025.
authors.forename: Michele J
authors.initials: MJ
authors.lastname: Esposito
mesh_terms: D023903:Coronary Restenosis / Q000517:prevention & control; D023921:Coronary Stenosis / Q000000981:diagnostic imaging* / Q000628:therapy*; D005260:Female; D005471:Fluoroscopy; D006801:Humans; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012371:Robotics; D015607:Stents; D016896:Treatment Outcome
keywords: Lesion measurement; Robotic PCI; Stenting