title: Plasma concentrations of interferon-alpha in patients with liver cirrhosis: relationship to systemic and portal hemodynamics.
abstract: BACKGROUND
  Nitric oxide (NO) plays an important role in the pathogenesis of the hyperdynamic circulation observed in portal hypertensive states. Interferon (IFN)-alpha can stimulate NO formation directly or indirectly via cytokines. However, IFN-alpha concentrations seem to increase or decrease in cirrhotic patients. This study investigated the plasma concentration of IFN-alpha in patients with cirrhosis and its relationship to systemic and portal hemodynamics.
  
  
  METHODS
  Thirty-six patients with cirrhosis and 47 healthy controls had blood samples taken for the determination of plasma concentrations of IFN-alpha by enzyme-linked immunosorbent assay. Systemic and portal hemodynamics were measured in patients with cirrhosis on the same day of blood sampling using Swan-Ganz catheterization and the thermodilution technique.
  
  
  RESULTS
  As compared with healthy subjects, patients with cirrhosis demonstrated a significantly higher IFN-alpha detectable rate (> 3 pg/ml, 14.9% vs 36.1%, p < 0.05). In cirrhotic patients, the IFN-alpha detectable rates were similar between those with and without decompensation, a hepatic venous pressure gradient greater than 12 mmHg, or the presence of large esophageal varices (p > 0.05). There was no significant difference in the systemic vascular resistance or hepatic venous pressure gradient between cirrhotic patients with and without a detectable plasma IFN-alpha concentration.
  
  
  CONCLUSIONS
  Plasma IFN-alpha concentrations tended to increase in patients with cirrhosis. However, IFN-alpha concentrations do not play a role in the hyperdynamic circulation observed in patients with cirrhosis.
authors.affiliation: Department of Medicine, Veterans General Hospital-Taipei, Taiwan, ROC.
authors.forename: Y Y
authors.initials: YY
authors.lastname: Wang
authors.forename: C J
authors.initials: CJ
authors.lastname: Chu
authors.forename: F Y
authors.initials: FY
authors.lastname: Lee
authors.forename: F Y
authors.initials: FY
authors.lastname: Chang
authors.forename: H C
authors.initials: HC
authors.lastname: Lin
authors.forename: R H
authors.initials: RH
authors.lastname: Lu
authors.forename: C C
authors.initials: CC
authors.lastname: Chan
authors.forename: T F
authors.initials: TF
authors.lastname: Wang
authors.forename: S S
authors.initials: SS
authors.lastname: Wang
authors.forename: S D
authors.initials: SD
authors.lastname: Lee
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006439:Hemodynamics; D006503:Hepatic Veins / Q000503:physiopathology; D006801:Humans; D016898:Interferon-alpha / Q000097:blood*; D008103:Liver Cirrhosis / Q000097:blood* / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D009569:Nitric Oxide / Q000502:physiology
chemical_list: D016898:Interferon-alpha; D009569:Nitric Oxide