What Researchers Did
Researchers monitored blood flow velocity in the middle cerebral artery using transcranial Doppler sonography in 23 subjects during 30-minute hyperbaric oxygen exposures at 2.8 bar.
What They Found
Hyperbaric oxygen decreased mean blood flow velocity (Vmean) in the middle cerebral artery, an effect observed in 23 subjects during uncomplicated exposures and 3 subjects with central nervous system oxygen toxicity. TCD Vmean was the most valuable monitoring variable, with a sudden increase in Vmean preceding clinical signs of toxicity in one subject.
Canadian Relevance
There is no direct Canadian connection mentioned for this study.
Study Limitations
The small number of subjects experiencing toxicity in this study limits the ability to draw definite conclusions.