[Changes in intracranial impedance during cerebral dehydration].
The intracranial impedance (34 kHz, AC) decreased by 20--40% during i. v. infusion of hypertonic mannitol and urea solutions (1.5 g/kg) and 1 hr later owing to osmotic dehydration of the brain tissue in cats. The specific resistance of the blood also diminished by 20--30% which contributed significantly to increasing of cerebral impedance oscillations. These findings make impedance methods unreliable for evaluation of cerebral circulation during dehydration therapy.
D000818:Animals; D001794:Blood Pressure; D001921:Brain / Q000503:physiopathology*; D001927:Brain Diseases / Q000503:physiopathology*; D002415:Cats; D002496:Central Venous Pressure; D002560:Cerebrovascular Circulation; D003681:Dehydration / Q000139:chemically induced / Q000503:physiopathology*; D004553:Electric Conductivity; D005260:Female; D005947:Glucose; D007427:Intracranial Pressure; D008297:Male; D008353:Mannitol; D010992:Plethysmography, Impedance; D014508:Urea
D008353:Mannitol; D014508:Urea; D005947:Glucose
Izmeneniia vnutricherepnogo impedansa pri degidratsii mozga.