title: Efficacy of Doppler ultrasonography for assessment of transjugular intrahepatic portosystemic shunt patency.
abstract: OBJECTIVE
  To assess the efficacy of Doppler ultrasonography (US) as a noninvasive method for monitoring patency of the transjugular intrahepatic portosystemic shunt (TIPS).
  
  
  METHODS
  Twenty-nine patients who had received TIPS for bleeding esophagogastric varices and/or refractory ascites with portal hypertension underwent Doppler US studies within 2 weeks after TIPS. Further studies were performed in 15 of them at 6 months, in 9 at 1 year, and in 4 at 2 years for a total of 57 US studies. The US findings were compared with the angiographic findings obtained at the same time.
  
  
  RESULTS
  In 45 of the 57 studies, shunt patency was found by Doppler US, correlating to 44 patencies and one occlusion on angiography. Doppler signal in the shunt could not be detected in 12 studies resulting in the diagnosis of shunt occlusion. This correlated with angiographic occlusion in 8 studies and patency in the remaining 4. All angiographically patent shunts that were occluded by Doppler US had various degrees of stenosis. A number of technical factors were found to be responsible for Doppler US false-positive or false-negative diagnoses, some related to the type of stent used. The Doppler US sensitivity was therefore 92%, the specificity 89%.
  
  
  CONCLUSIONS
  Doppler US is a reliable noninvasive method to evaluate patency of TIPS.
authors.affiliation: Department of Radiology, Wakayama Medical College, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kimura
authors.forename: M
authors.initials: M
authors.lastname: Sato
authors.forename: N
authors.initials: N
authors.lastname: Kawai
authors.forename: K
authors.initials: K
authors.lastname: Tanaka
authors.forename: T
authors.initials: T
authors.lastname: Sonomura
authors.forename: K
authors.initials: K
authors.lastname: Kishi
authors.forename: Y
authors.initials: Y
authors.lastname: Shioyama
authors.forename: M
authors.initials: M
authors.lastname: Terada
authors.forename: R
authors.initials: R
authors.lastname: Yamada
mesh_terms: D000328:Adult; D000792:Angiography; D004932:Esophageal and Gastric Varices / Q000000981:diagnostic imaging* / Q000601:surgery; D005260:Female; D006801:Humans; D006975:Hypertension, Portal / Q000150:complications; D008297:Male; D008875:Middle Aged; D011170:Portasystemic Shunt, Surgical; D015607:Stents; D018608:Ultrasonography, Doppler; D014654:Vascular Patency