May 1, 1992

The effect of chronic subarachnoid hemorrhage on basal endothelium-derived relaxing factor activity in intrathecal cerebral arteries

Journal of Neurosurgery
D H EdwardsT M Griffith

Abstract

The authors have investigated the hypothesis that loss of endothelium-derived relaxing factor (EDRF) activity contributes to cerebral vasospasm after subarachnoid hemorrhage. Adventitial exposure to hemoglobin was studied angiographically by injecting purified hemoglobin solution or autologous whole blood into the cisterna magna of anesthetized pigs. Both interventions induced intra- but not extracerebral vasoconstriction, which persisted for 2 and 7 days, respectively. Cyclic guanosine monophosphate (cGMP) levels were measured in isolated buffer-perfused pig intrathecal arteries to quantify inhibition of basal EDRF activity by hemoglobin. Adventitial exposure was less effective than intimal exposure, 10 microM hemoglobin applied adventitially for 30 minutes having an effect equivalent to that of 1 microM applied intraluminally for 5 minutes. The depression of cGMP levels by hemoglobin was reversible and equivalent to the effect of endothelial denudation or incubation with NG-nitro-L-arginine methyl ester, so that the effects of hemoglobin can be attributed to a specific action on EDRF rather than interaction with a nitric oxide-like substance produced by vascular smooth muscle or adventitial nerves. Cyclic GMP levels in isolat...Continue Reading

Mentioned in this Paper

Muscle, Smooth, Vascular
Nervousness
Arterial System
Subarachnoid Hemorrhage, Spontaneous
Whole Blood
Cyclic GMP Measurement (Lab Test)
Pathologic Vasoconstriction
Depressed - Symptom
Structure of Cisterna Magna
Cerebral Vasospasm

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