title: [The relationship between 31P magnetic resonance spectroscopy and the histopathology of livers of chronic viral hepatitis patients].
abstract: OBJECTIVE
  To investigate the correlations between 31P-magnetic resonance spectroscopy (MRS) findings and histopathological grading and staging of the livers of chronic viral hepatitis patients.
  
  
  METHODS
  Thirty-one patients with chronic viral hepatitis and 18 healthy volunteers were enrolled for this study. All of them underwent routine MRI plain scan and 31P-MRS of their livers. Peak areas of PME, PDE, PCr, Pi, gamma-ATP, beta-ATP and alpha-ATP were calculated. The concentrations of the phosphorus compounds of their livers, including PME, PDE, PCr, Pi, gamma-ATP, beta-ATP and alpha-ATP were measured. Percutaneous liver biopsies were performed on all 31 patients 0 to 7 days after their 31P-MRS examinations. Biopsy specimens were scored for fibrosis and necroinflammation according to the Knodell histological activity index. According to their necroinflammation scores, the 31 patients were divided into groups: slight hepatitis (7 patients), mild hepatitis (11), moderate hepatitis (8) and severe hepatitis (5). According to their fibrosis scores, the patients were divided into groups: no fibrosis (7 patients), portal fibrosis (11), bridging fibrosis (5) and cirrhosis (8).
  
  
  RESULTS
  The PME%, PDE% and PME/PDE of the hepatitis patients and of the control volunteers had significant statistical differences. The differences of PME%, PDE% and PME/PDE among different grades and stages also had statistical significance. When PME/PDE=0.78, 0.95 and 1.11 were set as the cut-off points for different grades of necroinflammation, and PME/PDE=0.79, 0.95 and 1.10 were set as the cut-off points for different stages of fibrosis, a sensitivity of 80.0%-87.5% and a specificity of 42.9%-72.7% were achieved.
  
  
  CONCLUSIONS
  PME/PDE is a sensitive marker for diagnosing the severity of chronic viral hepatitis. A rise of PME/PDE in hepatitis patients represents an increase of synthesis and a decrease in the breakdown of hepatocytes.
authors.affiliation: Department of Radiology, West China Hospital, Sichuan University, Chengdu 610041, China.
authors.forename: Bi
authors.initials: B
authors.lastname: Wu
authors.forename: Bin
authors.initials: B
authors.lastname: Song
authors.forename: Xiang-ping
authors.initials: XP
authors.lastname: Zhou
authors.forename: Yang
authors.initials: Y
authors.lastname: Yang
authors.forename: Xue-zhong
authors.initials: XZ
authors.lastname: Lei
authors.forename: Li-li
authors.initials: LL
authors.lastname: Jiang
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D005260:Female; D006521:Hepatitis, Chronic / Q000473:pathology*; D006801:Humans; D008099:Liver / Q000473:pathology*; D008103:Liver Cirrhosis / Q000473:pathology*; D008279:Magnetic Resonance Imaging; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D008875:Middle Aged; D012680:Sensitivity and Specificity