title: Major stent deformation/pseudofracture of 7 Crown Endeavor/Micro Driver stent platform: incidence and causative factors.
abstract: OBJECTIVE
  This is the initial report of stent deformation/pseudofracture of the 7 crown Endeavor/Micro Driver stent platform (2.25-2.75 mm), whereby the post-dilation balloon catches and causes major stent deformation angiographically appearing as a large stent fracture. We sought to determine frequency and cause.
  
  
  RESULTS
  Analysis of 1,000 consecutive Endeavor/Micro Driver stents (7 crown) deployed at our institution. Bench testing was also performed by deploying 10 stents in 2.5 mm tubing and then attempting re-crossing with non-compliant balloons.
  
  
  RESULTS
  There were 14 cases of major stent deformation/pseudofracture representing an incidence of 1.4% or 1.8% of 775 stents that were post-dilated. Of the 14 deformed stents, re-stenting was required in nine and MACE occurred in five (36%.). Benchtop results: Balloon "catch" was reproducible at an initial frequency of 9% and affected three of the 10 stents. With the use of provocative measures stent deformation occurred in 50% of test stents.
  
  
  CONCLUSIONS
  Stent deformation/pseudofracture of the 7 crown Endeavor/Micro Driver platform occurred in 1.8% of cases that were post-dilated. Of these, 36% experience MACE. Deformation can be reproduced on the benchtop. Operators should be aware of the complication, and develop strategies to deal with it.
authors.affiliation: Eastern Heart Clinic, Prince of Wales Hospital, Sydney, Australia. mark.pitney@ehc.com.au
authors.forename: Mark
authors.initials: M
authors.lastname: Pitney
authors.forename: Kate
authors.initials: K
authors.lastname: Pitney
authors.forename: Nigel
authors.initials: N
authors.lastname: Jepson
authors.forename: Daniel
authors.initials: D
authors.lastname: Friedman
authors.forename: Tuan
authors.initials: T
authors.lastname: Nguyen-Dang
authors.forename: Joseph
authors.initials: J
authors.lastname: Matthews
authors.forename: Robert
authors.initials: R
authors.lastname: Giles
authors.forename: David
authors.initials: D
authors.lastname: Taylor
mesh_terms: D015906:Angioplasty, Balloon, Coronary; D017023:Coronary Angiography; D006801:Humans; D015994:Incidence; D015607:Stents / Q000009:adverse effects*