What Researchers Did
Researchers retrospectively studied 59 military divers with neurological decompression sickness who received hyperbaric recompression treatment within six hours of symptom onset to identify risk factors for severe outcomes.
What They Found
The median time to hyperbaric treatment was 35 minutes. After one month, 25.4% of divers still had incomplete resolution of their symptoms. Severe symptoms like sensory and motor deficits (odds ratio 4.1) or bladder dysfunction (odds ratio 9.99) were strong predictors of poor recovery, while a longer delay to treatment had a negligible impact on outcome.
What This Means for Canadian Patients
For Canadian divers experiencing neurological decompression sickness, this study suggests that the severity of their initial symptoms is a more critical factor for recovery than how quickly they receive hyperbaric recompression. While prompt treatment is always recommended, patients should understand that the nature of their initial neurological deficits may largely determine their long-term outcome.
Canadian Relevance
Although this was not a Canadian study, it covers decompression sickness, which is a Health Canada-recognised indication for hyperbaric oxygen therapy.
Study Limitations
This study was limited by its retrospective design, relatively small sample size of 59 military divers, and may not be generalizable to all types of divers.