What Researchers Did
Researchers irradiated the brains of rats at 10 Gray, a dose similar to therapeutic levels in cancer treatment, and then tested whether HBOT could prevent or reverse the resulting memory and learning problems.
What They Found
Rats that received whole-brain radiation had significantly worse spatial memory and learning compared to non-irradiated rats, along with higher levels of brain inflammation, cell death among new neurons, and oxidative damage. HBOT significantly prevented and reversed all of these effects, restoring learning scores and reducing brain inflammation, new neuron death, and lipid peroxidation.
What This Means for Canadian Patients
For Canadian cancer patients who receive radiation to the brain, such as those treated for primary brain tumors or brain metastases, cognitive decline is a known long-term side effect. This animal study suggests HBOT may both prevent and treat radiation-induced memory loss by protecting brain cell growth and reducing inflammation.
Canadian Relevance
Delayed radiation injury to the brain is an OHIP-covered indication for HBOT in Ontario.
Study Limitations
This was an animal study in rats; brain radiation doses and biological responses in humans differ, and the findings require confirmation in clinical trials.