What Researchers Did
Researchers investigated if measuring pupil size and light reflex could objectively detect gas narcosis in divers breathing hyperbaric air or different levels of nitrous oxide.
What They Found
Pupil size did not significantly change in 16 subjects exposed to hyperbaric air at 608 kPa (equivalent to 50 meters' depth) or in 12 subjects exposed to 20-40% nitrous oxide. The pupil light reflex was only significantly affected at the highest nitrous oxide level of 40% end-tidal concentration. The study concluded that pupillometry is not a suitable method for monitoring gas narcosis in diving.
What This Means for Canadian Patients
Canadian patients who are divers or work in hyperbaric environments should be aware that pupillometry is not an effective tool for detecting gas narcosis. This means other established methods for monitoring diver safety and narcosis symptoms remain crucial for preventing accidents and ensuring well-being during deep dives.
Canadian Relevance
This study involved Canadian authors, making it directly relevant to Canadian diving research. It does not cover a Health Canada-recognized HBOT treatment indication.
Study Limitations
The study was conducted in a dry hyperbaric environment, which may not fully replicate the complex physiological stressors of actual underwater diving.