Ultrastructural changes in feline arterial endothelium following subarachnoid hemorrhage

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✓ Scanning electron microscopy of feline basilar arterial endothelium 4 hours and 1, 3, 5, and 7 days after subarachnoid hemorrhage (SAH) showed longitudinal furrows that correlated with angiographically demonstrated vasospasm. These ridges persisted after fixation at physiological pressure, and probably reflected medial contraction with undulation of the underlying elastic lamina. No change in endothelial cell morphology or thrombogenesis was observed as long as 7 days after SAH. There is no evidence from this study to suggest that ischemia from vasospasm is a product of thromboembolism from damaged endothelial surfaces.

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Address reprint requests to: Thoralf M. Sundt, Jr., M.D., Mayo Clinic, 200 First Street S.W., Rochester, Minnesota 55901.
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