title: Portal decompression after transjugular intrahepatic portosystemic shunt creation with use of a spiral Z stent.
abstract: OBJECTIVE
  An experimental swine model of acute presinusoidal portal hypertension was used to investigate the feasibility of a spiral Z stent for transjugular intrahepatic portosystemic shunt (TIPS) placement and the correlation between the shunt (stent) size and degree of portal pressure decrease.
  
  
  METHODS
  Twelve young swine were used. Acute portal hypertension was induced by means of selective injections of absolute alcohol, ethiodized oil, and polyvinyl alcohol sponge particles into intrahepatic portal branches.
  
  
  RESULTS
  TIPS was successfully created in all swine by using spiral Z stents that were 6, 8, and 10 mm in diameter; each size stent was deployed in four animals. Being sufficiently flexible, spiral Z stents accommodated for curved shunt tracts. An average of 48% portal pressure decrease was achieved with 6-mm-diameter stents, 61% with 8-mm-diameter stents, and 87% with 10-mm-diameter stents.
  
  
  CONCLUSIONS
  These results are in agreement with our clinical experience with use of Gianturco-Rösch Z stents for TIPS formation.
authors.affiliation: Dotter Institute for Interventional Therapy, Oregon Health Sciences University, Portland 97201.
authors.forename: K
authors.initials: K
authors.lastname: Nakamura
authors.forename: S
authors.initials: S
authors.lastname: Takashima
authors.forename: K
authors.initials: K
authors.lastname: Kichikawa
authors.forename: B T
authors.initials: BT
authors.lastname: Uchida
authors.forename: F S
authors.initials: FS
authors.lastname: Keller
authors.forename: J
authors.initials: J
authors.lastname: Rösch
mesh_terms: D000818:Animals; D004867:Equipment Design; D005240:Feasibility Studies; D006975:Hypertension, Portal / Q000628:therapy*; D008102:Liver Circulation / Q000502:physiology; D017082:Portal Pressure / Q000502:physiology; D011170:Portasystemic Shunt, Surgical / Q000379:methods*; D015607:Stents; D013552:Swine