title: [Changes of cerebral hemodynamics in patients with virus encephalitis].
abstract: OBJECTIVE
  To explore the changes of cerebral hemodynomics in patients with virus encephalitis (VE).
  
  
  METHODS
  Within the initial 24 h and 21 days after admission, respectively, the patients with acute VE (n=38) suspected to result from viral infections were examined with serial transcranial Doppler ultrasound (TCD) for measurements of the systolic flow velocity (Vs), mean blood velocity (Vm) and the pulsatility index (PI) in the middle, anterior and posterior cerebral arteries (MCA, ACA, PCA) and the basilar artery (BA).
  
  
  RESULTS
  TCD showed normal findings in 11 and abnormal findings in 27 patients, with a positivity rate of 71%. The Vms were significantly elevated in MCA, ACA, PCA, vertebral artery and BA during the acute phase of VE compared with that of the 30 normal control subjects (P<0.001-0.05). The PIs were significantly increased in MCA, PCA and BA (P<0.001).
  
  
  CONCLUSIONS
  TCD findings indicate the presence of cerebral vasospasm in VE during the acute phase.
authors.affiliation: Department of Neurology, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China.
authors.forename: Qun
authors.initials: Q
authors.lastname: Wang
authors.forename: Xin
authors.initials: X
authors.lastname: Xia
authors.forename: Hui-Juan
authors.initials: HJ
authors.lastname: Yuan
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001783:Blood Flow Velocity; D002560:Cerebrovascular Circulation / Q000502:physiology*; D018792:Encephalitis, Viral / Q000000981:diagnostic imaging / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017585:Ultrasonography, Doppler, Transcranial