Experimental analysis of brain surface elastance in cats.
Brain surface elastance, defined as the pressure needed to compress the cortex 3 mm, was measured using the ophthalmodynamometer in six cats using three burr holes (frontal, parietal, and occipital) on each side. An intracranial mass was then used to compress the right side for 3 hours, and cardiac arrest was induced after the mass was removed. Elastance was measured four times: before insertion of the mass, 10 and 70 minutes after removal of the mass, and 60 minutes after cardiac arrest. The results showed that: brain surface elastance does not change between sides, but varies among regions with the parietal region having the highest elastance; elastance increases after compression by an intracranial mass, but not after cardiac arrest; and stiff brain tends to restore poorly. Elastance is apparently increased by the formation of edema. Measuring brain elastance may be useful in predicting brain restoration subsequent to removal of mass lesions.
Fukuhara
T
T
Department of Neurological Surgery, Okayama University Medical School.
Nishio
S
S
Kawauchi
M
M
Asari
S
S
Ohmoto
T
T
Akioka
T
T
D000818:Animals; D001921:Brain / Q000502:physiology* / Q000503:physiopathology; D002545:Brain Ischemia / Q000503:physiopathology; D002415:Cats; D004548:Elasticity; D009884:Ophthalmodynamometry