title: The revascular active percutaneous interventional device for coronary total occlusions study.
abstract: BACKGROUND
  Despite the well-documented benefit of recanalization of an occluded vessel in some symptomatic patients, attempt is only performed in a minority of them. Percutaneous coronary intervention (PCI) of CTO is associated with high incidence of complications and unsuccessful procedure, mainly due to inability to cross the lesion. We sought to evaluate the efficacy and safety of the novel RVT CTO Guidewire Device (RVT-GDW, ReVascular Therapeutics, Sunnyvale, CA) in this complex scenario.
  
  
  METHODS
  The RAPID-CTO study is a non-randomized, single center, first-in-man evaluation of a new guidewire system for treatment of CTO. The RVT-GDW is a new device designed to provide enhanced penetration and positioning control for crossing CTO via: (1) an 0.014 "guidewire with a mechanically active distal end; (2) a handle attached proximally to the guidewire, with an adjustable torquer, and interfaced to (3) a non-disposable, battery-operated, control unit, that provides activation control and audio feedback during the CTO crossing procedure. Per protocol, the RVT-GDW device was only used after at least 5 min (fluoroscopy time) of attempt with commercially available conventional guidewires to cross the target lesion.
  
  
  RESULTS
  A total of 16 patients (16 lesions) were treated with the RVT-GDW. Mean age was 56.25 years, 56.2% were men, and 25% diabetics. The average duration of occlusion was 4.7 +/- 2.1 months. The mean vessel reference diameter was 2.76 +/- 0.31 mm and the mean lesion length was 16.64 +/- 7.70 mm (range 4.37-35.0 mm). Thirteen patients (81.2%) had "tapered stump" morphology at the proximal end of the occlusion, and a side branch was involved in 12 (75.0%). All lesions had contralateral circulation; bridging collaterals were seen in three (18.7%). Procedural success was achieved in 10 lesions (62.5%), with an average procedural time of 111.43 +/- 35.76 min. There were no major adverse cardiac events at both in-hospital and 30-day clinical follow-up.
  
  
  CONCLUSIONS
  The first-in-man RAPID-CTO study suggests that the novel RVT-GDW device is technically feasible, safe and effective in crossing chronically occluded coronary arteries. Larger studies are warranted.
authors.affiliation: Interventional Cardiology Department, Instituto Dante Pazzanese de Cardiologia, São Paulo, Brasil.
authors.forename: Daniel
authors.initials: D
authors.lastname: Chamié
authors.forename: Alexandre
authors.initials: A
authors.lastname: Abizaid
authors.forename: José Ribamar
authors.initials: JR
authors.lastname: Costa
authors.forename: Fausto
authors.initials: F
authors.lastname: Feres
authors.forename: Andréa
authors.initials: A
authors.lastname: Abizaid
authors.forename: Rodolfo
authors.initials: R
authors.lastname: Staico
authors.forename: Ricardo
authors.initials: R
authors.lastname: Costa
authors.forename: Luiz Alberto P
authors.initials: LA
authors.lastname: Mattos
authors.forename: Amanda G M R
authors.initials: AG
authors.lastname: Sousa
authors.forename: J Eduardo
authors.initials: JE
authors.lastname: Sousa
mesh_terms: D015906:Angioplasty, Balloon, Coronary / Q000009:adverse effects / Q000295:instrumentation* / Q000379:methods; D002908:Chronic Disease; D017023:Coronary Angiography; D054059:Coronary Occlusion / Q000000981:diagnostic imaging / Q000628:therapy*; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged