title: Angioplasty balloon compliance: can in vivo size be predicted from in vitro pressure profile measurements?
abstract: OBJECTIVE
  This study was undertaken to determine whether the behavior of angioplasty balloons within coronary arteries may differ from that anticipated from data provided by the manufacturers. In particular, the in vitro pressure-diameter profiles may not truly represent in vivo sizes.
  
  
  METHODS
  Thus, we assessed the degree of correlation of in vitro with in vivo measurements obtained during routine angioplasty practice. In vivo size of 2.5 mm compliant (n = 8) and 3 mm semicompliant (n = 8) balloons was assessed using quantitative angiography for first, second, and third inflations.
  
  
  RESULTS
  In vivo size was less than expected from in vitro measurements. In general balloon diameter increased with inflation pressures up to 8 atmospheres, and some degree of elastic recoil was evident with both balloon types after the last inflation.
  
  
  CONCLUSIONS
  In vivo balloon size may not be accurately predicted from manufacturers' published data. Size is more likely to be affected by factors such as lesion characteristics and elasticity of the vessel wall than by balloon material compliance characteristics.
authors.affiliation: Academic Department of Cardiology, Glenfield General Hospital, Leicester, UK.
authors.forename: R S
authors.initials: RS
authors.lastname: More
authors.forename: M J
authors.initials: MJ
authors.lastname: Brack
authors.forename: A H
authors.initials: AH
authors.lastname: Gershlick
mesh_terms: D000800:Angioplasty, Balloon / Q000295:instrumentation*; D017023:Coronary Angiography; D003327:Coronary Disease / Q000000981:diagnostic imaging / Q000628:therapy*; D003331:Coronary Vessels / Q000473:pathology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies