title: Acoustic radiation force impulse (ARFI) elastography in acute liver failure: necrosis mimics cirrhosis.
abstract: Acoustic radiation force Impulse (ARFI) technology correlates shear-wave velocity with fibrosis. It can differentiate between advanced fibrosis and normal tissue in chronic liver disease. However, specificity is impaired by cholestasis, inflammation or oedema in acute hepatitis. In patients with acute liver failure (ALF) necessitating liver transplantation ARFI has not been evaluated yet. We investigated 3 patients with ALF and compared their ARFI results to those of healthy controls (n = 33) and cases with liver cirrhosis (n = 21). In the 3 ALF patients shear-wave velocities were 3.0, 2.5, and 2.7 m/s, respectively. These results were significantly increased compared to those of healthy controls (median: 1.13 m/s; p < 0.001) and similar to those of cirrhotic individuals (median: 2.93 m/s). Two individuals underwent liver transplantation. Explants showed massive necrosis, but no signs of chronic liver disease. Patient 3 recovered spontaneously and showed decreasing ARFI results during follow-up. In conclusion, hepatic necrosis can mimic liver cirrhosis at ARFI evaluation in ALF patients and this impairs the specificity of ARFI.
authors.affiliation: Dept. of Gastroenterology, University of Leipzig.
authors.forename: T F
authors.initials: TF
authors.lastname: Karlas
authors.forename: C
authors.initials: C
authors.lastname: Pfrepper
authors.forename: J
authors.initials: J
authors.lastname: Rosendahl
authors.forename: C
authors.initials: C
authors.lastname: Benckert
authors.forename: C
authors.initials: C
authors.lastname: Wittekind
authors.forename: S
authors.initials: S
authors.lastname: Jonas
authors.forename: J
authors.initials: J
authors.lastname: Moessner
authors.forename: M
authors.initials: M
authors.lastname: Tröltzsch
authors.forename: H L
authors.initials: HL
authors.lastname: Tillmann
authors.forename: T
authors.initials: T
authors.lastname: Berg
authors.forename: V
authors.initials: V
authors.lastname: Keim
authors.forename: J
authors.initials: J
authors.lastname: Wiegand
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D054459:Elasticity Imaging Techniques / Q000379:methods*; D005260:Female; D006801:Humans; D008103:Liver Cirrhosis / Q000175:diagnosis*; D017114:Liver Failure, Acute / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged; D009336:Necrosis / Q000000981:diagnostic imaging / Q000473:pathology