What Researchers Did
Researchers used SPECT imaging to investigate the effects of normobaric and hyperbaric oxygen breathing on cerebral blood flow in 10 professional divers compared to 6 normal volunteers.
What They Found
While ANOVA showed no significant overall difference in cerebral blood flow distribution, individual analysis revealed that divers experienced decreased cerebral blood flow in 33 regions of interest during normobaric oxygen and 46 regions during hyperbaric oxygen compared to controls.
Specifically, two divers showed a notable increase of 7 and 5 hypoperfused regions, respectively, during hyperbaric oxygen exposure, indicating a patchy distribution of brain hypoperfusion that was more pronounced in the hyperbaric state.
Canadian Relevance
This study has no direct Canadian connection.
Study Limitations
The study's small sample size and the need for further research to identify divers prone to harmful oxygen effects are notable limitations.