Acute changes in intracranial pressure and pressure-volume index after forebrain ischemia in normoglycemic and hyperglycemic rats.

Published

Journal Article

BACKGROUND AND PURPOSE: Hyperglycemia enhances the deleterious effect of global cerebral ischemia. One possible explanation is that increased anaerobic glycolysis leads to exaggeration of intracellular acidosis and increased postischemic edema. To examine the importance of this edema on postischemic cerebral perfusion dynamics, we measured acute changes in intracranial pressure (ICP), specific gravity, and the pressure-volume index (PVI) after forebrain ischemia in normoglycemic and hyperglycemic rats. METHODS: Rats underwent 15 minutes of forebrain ischemia and 90 minutes of reperfusion. ICP and mean arterial pressure were continuously monitored. Before ischemia, rats received either saline or glucose intravenously. Ninety minutes after ischemia, the specific gravity of the neocortex was measured. In a second experiment, the PVI was measured at 20 and 60 minutes after ischemia. RESULTS: Preischemic ICP (mean+/-SD) was 7 +/- 1 mm Hg in both groups. A peak ICP (approximately 11 mm Hg) occurred within 15 to 20 minutes after ischemia in both groups. Between 25 and 80 minutes after ischemia, ICP was significantly but only slightly greater in hyperglycemic than in normoglycemic rats. Cerebral perfusion pressure was similar between groups and remained greater than 100 mm Hg. Specific gravity was also similar for both groups but was less than normal values. The PVI in hyperglycemic rats was lower than in normoglycemic rats, indicating reduced compliance. CONCLUSIONS: These findings indicate that hyperglycemia-augmented intraischemic tissue acidosis does not contribute to worsened outcome by means of compromised cerebral perfusion pressure during the early stages of recovery. Nevertheless, evidence was found for decreased cerebral compliance, indicating an effect of hyperglycemia on intracranial volume compartments other than cortical parenchyma.

Full Text

Duke Authors

Cited Authors

  • Morimoto, Y; Warner, DS; Pearlstein, RD

Published Date

  • August 1996

Published In

Volume / Issue

  • 27 / 8

Start / End Page

  • 1405 - 1409

PubMed ID

  • 8711810

Pubmed Central ID

  • 8711810

International Standard Serial Number (ISSN)

  • 0039-2499

Digital Object Identifier (DOI)

  • 10.1161/01.str.27.8.1405

Language

  • eng

Conference Location

  • United States