title: [Noninvasive monitoring of hypertensive intracerebral hemorrhage and perihematomal tissue edema].
abstract: OBJECTIVE
  To investigate the dynamic change regularity of intracerebral hemorrhage and perihematomal tissue edema.
  
  
  METHODS
  The cerebral electric impedance (CEI) of 100 normal volunteers and 24 patients with hypertensive intracerebral hemorrhage was measured, and the results of measurement were compared with the volumes of hematoma detected by CT.
  
  
  RESULTS
  In the normal persons, the CEI values in the left and right sides of cerebral hemispheres were 11.5 +/- 1.3 k(Omega) vs 11.4 +/- 1.8 k(Omega) at the frequency of 20 kHz, 10.2 +/- 1.0 k(Omega) vs 10.3 +/- 1.1 k(Omega) at the frequency of 50 kHz, and 9.1 +/- 0.8 k(Omega) vs 9.2 +/- 0.8 k(Omega) at the frequency of 100 kHz (all P > 0.05). Age, sex and measuring time did not obviously affect the CEI values. In the patients with hypertensive intracerebral hemorrhage the CEI of hematoma side was significantly decreased within 2 days after onset and then increased significantly for more than 10 days. The rate of EI change in the hematoma side within 24 h had a negative correlation with the volume of hematoma (r = -0.895 3, P < 0.01). however, the rate of CEI change in the hematoma side had a positive correlation with the volume of perihematomal edema (r = 0.881 1, P < 0.01).
  
  
  CONCLUSIONS
  CEI is a stable physical parameter reflecting the electrical character of human brain tissue. CEI sensitively reflects the change of hematoma and perihematomal edema, and guides the clinical treatment of cerebral hemorrhage.
authors.affiliation: Institute of Neurology, Chongqing University of Medical Sciences, Chongqing 400016, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Hao
authors.initials: H
authors.lastname: Yang
authors.forename: Ping
authors.initials: P
authors.lastname: Wang
authors.forename: Wei-wei
authors.initials: WW
authors.lastname: Dong
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001929:Brain Edema / Q000175:diagnosis*; D017097:Electric Impedance; D005260:Female; D006801:Humans; D020299:Intracranial Hemorrhage, Hypertensive / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged