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The effect of mannitol on cerebral white matter water content
Abstract:
The authors have studied the effect of a low-dose (0.28 gm/kg) bolus infusion of mannitol on brain water in man. In eight patients with severe head injury, small pieces of subcortical white matter were taken at craniotomy both before and after infusion of mannitol. The tissue specific gravity was measured using a graduated specific-gravity column, and from it the brain water content was calculated. White matter specific gravity rose from a mean (+/- standard error of the mean) of 1.0325 +/- 0.0012 before mannitol infusion to 1.0352 +/- 0.0011 after mannitol administration, and the brain water content fell from a mean of 80.94% +/- 2.5% to 75.28% +/- 2.3%. The differences were significant (p less than 0.01). This study shows that, after head injury in man, mannitol increases the white matter specific gravity and probably does so by reducing brain water.
Insights
Low-dose mannitol infusion significantly reduced brain water content in patients with severe head injury. This study demonstrates mannitol
Area of Science:
- Neuroscience
- Neurosurgery
- Pharmacology
Background:
- Severe head injury often leads to increased intracranial pressure due to cerebral edema.
- Cerebral edema management is critical in reducing secondary brain injury.
- Mannitol is a hyperosmotic agent commonly used to reduce intracranial pressure.
Purpose of the Study:
- To investigate the effect of a low-dose mannitol infusion on brain water content in patients with severe head injury.
- To quantify changes in white matter specific gravity and brain water percentage post-mannitol administration.
Main Methods:
- A low-dose (0.28 gm/kg) bolus infusion of mannitol was administered to eight patients with severe head injury.
- Subcortical white matter biopsies were obtained before and after mannitol infusion during craniotomy.
- Tissue specific gravity was measured to calculate brain water content.
Main Results:
- White matter specific gravity increased significantly from 1.0325 to 1.0352 after mannitol infusion (p < 0.01).
- Brain water content in white matter decreased significantly from a mean of 80.94% to 75.28% (p < 0.01).
- The observed changes indicate a reduction in brain water following mannitol administration.
Conclusions:
- Low-dose mannitol effectively reduces brain water content in patients with severe head injury.
- Mannitol administration increases white matter specific gravity, likely by decreasing brain water.
- These findings support the use of mannitol in managing cerebral edema after head injury.