What Researchers Did
Researchers measured oxidative stress markers and antioxidant enzyme activity in 40 patients with sudden hearing loss before and after 14 HBOT sessions in a hyperbaric chamber, comparing results to 20 healthy controls.
What They Found
After 14 HBOT sessions, glutathione peroxidase activity increased by 28% and superoxide dismutase decreased by 7%. Patients with sudden hearing loss had higher oxidative stress markers at baseline compared to healthy controls, suggesting oxidative damage plays a role in the condition.
What This Means for Canadian Patients
This study shows that sudden hearing loss involves measurable oxidative stress in blood, and that HBOT modulates the antioxidant enzyme system -- potentially one mechanism by which HBOT helps restore hearing. Canadian audiologists and ENT specialists can use this to explain to patients why HBOT may be more than just an oxygen delivery tool.
Canadian Relevance
No direct Canadian connection identified.
Study Limitations
The study measured blood markers of oxidative stress rather than directly measuring inner ear oxygenation; the connection between blood antioxidant changes and hearing recovery was not directly tested.