title: Right hemidiaphragmatic mobility: assessment with US measurement of craniocaudal displacement of left branches of portal vein.
abstract: OBJECTIVE
  To evaluate the correlation and agreement between ultrasonographic (US) measurement of craniocaudal displacement of the left intrahepatic branches of the portal vein and radiographic measurement of right hemidiaphragmatic mobility.
  
  
  METHODS
  Fifty-one patients with indications for abdominal angiography or percutaneous cholangiography prospectively underwent radiographic evaluation of right hemidiaphragmatic mobility and B-mode US measurement of craniocaudal displacement of the left intrahepatic branches of the portal vein. US was performed by using a 3.5-MHz convex transducer in a right subcostal position with a longitudinal orientation. Statistical analyses were performed by using linear regression, paired Student t test, and Bland-Altman analyses.
  
  
  RESULTS
  The correlation between the US and radiographic measurements was found to be linear: hemidiaphragmatic mobility = (-1.562 + 1.032) x portal vein branch displacement (r = 0.651, P <.001). The mean craniocaudal displacement of the intrahepatic branches of the portal vein measured at US was 35.2 mm +/- 10.7 (SD). The mean right hemidiaphragmatic mobility measured at radiography was 34.8 mm +/- 17.0. The mean difference between the two measurements was not statistically significant (0.4 mm +/- 12.9, P =.807).
  
  
  CONCLUSIONS
  US measurement of craniocaudal displacement of the left intrahepatic branches of the portal vein can be used for indirect assessment of right hemidiaphragmatic mobility.
authors.affiliation: Department of Radiology, University of São Paulo Medical School, Brazil. tolecosta@hotmail.com
authors.forename: Nair S G
authors.initials: NS
authors.lastname: Toledo
authors.forename: Sergio K
authors.initials: SK
authors.lastname: Kodaira
authors.forename: Paulo C B
authors.initials: PC
authors.lastname: Massarollo
authors.forename: Osvaldo I
authors.initials: OI
authors.lastname: Pereira
authors.forename: Sergio
authors.initials: S
authors.lastname: Mies
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D003964:Diaphragm / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D016014:Linear Models; D008099:Liver / Q000098:blood supply* / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D011169:Portal Vein / Q000000981:diagnostic imaging*; D011446:Prospective Studies; D011859:Radiography; D014463:Ultrasonography