Brain Volume Determination in Subarachnoid Hemorrhage Using Rats

Area of Science:

• Neuroscience
• Biomedical Engineering
• Pathology

Background:

• Brain edema is commonly assessed using the wet-dry method, which may not fully capture volumetric changes.
• Accurate brain volume measurement is crucial for understanding injury progression and treatment efficacy.

Purpose of the Study:

• To test the hypothesis that dried brain tissue can be rehydrated and measured to determine actual brain volume.
• To develop a modified method for precise post-mortem brain volume quantification.

Main Methods:

• Subarachnoid hemorrhage (SAH) was induced in rats, followed by neurobehavioral evaluation and brain water content determination.
• Dried brain tissue was reconstituted with lost water and centrifuged.
• Brain volume was quantified using hydrostatic principles and Archimedes' principle.

Main Results:

• SAH significantly increased brain water content and brain volume.
• Volumetric measurements revealed significant brain swelling post-SAH, exceeding edema-based estimations.
• Neurological function worsened concurrently with increased brain water and volume.

Conclusions:

• The modified wet-dry method allows for accurate brain volume determination from dried tissue.
• This technique offers a valuable post-mortem assessment of brain swelling and volumetric changes.
• It provides a more comprehensive understanding of brain injury than edema percentage alone.