What Researchers Did
Researchers tested whether a single hyperbaric oxygen therapy (HBOT) session changes the healthy retina, using eye scans and electrical retina tests before and after treatment.
What They Found
This clinical study examined 20 patients undergoing HBOT for sensorineural hearing loss or avascular necrosis, measuring retinal function and structure before and within 24 hours after a single session, and found a statistically significant change in one electrical retinal measure along with thickening in one retinal layer. The scotopic 0.01 ERG b-wave amplitude differed significantly before versus after HBOT (p equals 0.029). The retinal pigment epithelium in the 3-mm nasal subfield of the ETDRS grid showed statistically significant thickening after the session (p equals 0.023). Participants averaged 43.2 years old, ranging from 18 to 66.
What This Means for Canadian Patients
For patients in Canada receiving HBOT for conditions such as sensorineural hearing loss or avascular necrosis, this study found that a single session was associated with a measurable change in rod-bipolar cell electrical activity in the retina. The abstract does not report whether this change persists, reverses, or affects vision, so its practical significance for patients is not established.
Canadian Relevance
No direct Canadian connection identified.
Study Limitations
The study involved only 20 patients with a single follow-up point within 24 hours, and the abstract states that further studies are needed to determine how long the observed electrophysiological changes last or whether they reverse.