Nonhyperemic blood flow restoration and brain edema in experimental focal cerebral ischemia.

Abstract:

:The effect of suppression of postischemic reactive hyperemia on the blood-brain barrier (BBB) and ischemic brain edema after temporary focal cerebral ischemia was studied in cats under ketamine and alpha-chloralose anesthesia. Regional cerebral blood flow (rCBF) was measured by a thermal diffusion method and a hydrogen clearance method. The animals were separated into three groups. In Group A, the left middle cerebral artery (MCA) was occluded for 6 hours. In Group B, the MCA was occluded for 3 hours and then reperfused for 3 hours; postischemic hyperemia was suppressed to the preischemic level by regulating the degree of MCA constriction. In Group C, the MCA was occluded for 3 hours and reperfused for 3 hours without suppressing the postischemic reactive hyperemia. The brain was removed and cut coronally at the site of rCBF measurement. The degree of ischemic edema was assessed by gravimetry in samples taken from the coronal section and correlated with the degree of BBB disruption at the corresponding sites, evaluated by densitometric determination of Evans blue discoloration. The findings showed that 1) ischemic edema was significantly exacerbated by postischemic hyperemia during reperfusion in parallel with the degree of BBB opening to serum proteins, and 2) suppression of postischemic hyperemia significantly reduced the exacerbation of ischemic edema and BBB opening. These findings indicate that blood flow may be restored without significant exacerbation of postischemic edema by the suppression of postischemic hyperemia in focal cerebral ischemia.

journal_name

J Neurosurg

journal_title

Journal of neurosurgery

authors

Kuroiwa T,Shibutani M,Okeda R

doi

10.3171/jns.1989.70.1.0073

subject

Has Abstract

pub_date

1989-01-01 00:00:00

pages

73-80

issue

1

eissn

0022-3085

issn

1933-0693

journal_volume

70

pub_type

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