What Researchers Did
Researchers conducted a prospective, blinded trial to determine if experienced divers or hyperbaric chamber attendants could accurately discern chamber pressure and breathing gas.
What They Found
Out of 42 participants, 19 (45%) could not estimate their depth, and only 3 (13%) of those who attempted were within 2 feet of the actual depth. There was no correlation between actual and estimated depth (p = 0.98), and participants also could not discern between breathing air or oxygen. These findings suggest experienced divers cannot discriminate between chamber pressures of 1.2 and 1.5 atm abs.
What This Means for Canadian Patients
This study suggests that experienced individuals can participate in blinded hyperbaric oxygen trials without compromising the integrity of the masking. For Canadian patients, this means that future hyperbaric oxygen therapy trials can be designed with greater confidence in the blinding, leading to more reliable and trustworthy results.
Canadian Relevance
This study has no direct Canadian connection.
Study Limitations
The study's findings are specific to the tested pressure range of 1.2 and 1.5 atm abs, which may limit generalizability to other hyperbaric conditions.