Nimodipine posttreatment does not increase blood flow in rats with focal cortical ischemia

We used laser-Doppler flowmetry to study the effect of nimodipine administered after the onset of focal cortical ischemia on regional cerebral blood flow in 16 halothane-anesthetized, mechanically ventilated Wistar rats. We selected the Wistar rats strain since it would provide a wide range of ische...

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Bibliographic Details
Published in:Stroke (1970) 1990-09, Vol.21 (9), p.1357-1361
Main Authors: DIRNAGL, U, JACEWICZ, M, PULSINELLI, W
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Brain Ischemia - physiopathology
Cardiovascular system
Cerebral Cortex - blood supply
Cerebrovascular Circulation - drug effects
Lasers
Male
Medical sciences
Nimodipine - pharmacology
Pharmacology. Drug treatments
Rats
Rats, Inbred Strains
Ultrasonography
Vasodilator agents. Cerebral vasodilators
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Summary:We used laser-Doppler flowmetry to study the effect of nimodipine administered after the onset of focal cortical ischemia on regional cerebral blood flow in 16 halothane-anesthetized, mechanically ventilated Wistar rats. We selected the Wistar rats strain since it would provide a wide range of ischemia severities to test the vascular response to nimodipine. Laser-Doppler probes continuously recorded regional cerebral blood flow at two or three sites over the parietal cortex (dura intact) while brain temperature was regulated at 37 degrees C. Occlusion of the right middle cerebral and common carotid arteries reduced cerebral blood flow to a mean of 38% (range 13-77%) of baseline. Thirty minutes later, either 2 micrograms/kg/min nimodipine (n = 8) or its vehicle, polyethylene glycol 400 (n = 8), was administered by a continuous intravenous infusion. Over 60 minutes of treatment, both the nimodipine-treated and vehicle-treated groups showed a trivial (3%) mean increase in cerebral blood flow. Nimodipine failed to augment cerebral blood flow regardless of whether the cortex was severely, moderately, or mildly ischemic.
ISSN:0039-2499
1524-4628
DOI:10.1161/01.STR.21.9.1357