What Researchers Did
Researchers in Taiwan reviewed records of 62 carbon monoxide poisoning patients who developed delayed neuropsychiatric symptoms after their initial poisoning, comparing those who received HBOT versus those who did not over 12 months.
What They Found
Of 11 patients who recovered, receiving HBOT after DNS onset was strongly associated with improvement (72.7% vs 25.5%, p=0.006). More than three HBOT sessions during the acute phase also predicted DNS recovery (81.8% vs 27.5%, p=0.003). The best window was within 3 days of DNS diagnosis, with 87.5% sensitivity for predicting improvement.
What This Means for Canadian Patients
Carbon monoxide poisoning can cause brain symptoms days or weeks after the initial event. Prompt HBOT, ideally within 3 days of delayed symptoms appearing, significantly improves 1-year outcomes. Canadian patients treated for CO poisoning should be monitored for DNS and referred for HBOT promptly if symptoms emerge.
Canadian Relevance
Carbon monoxide poisoning is an OHIP-covered indication for HBOT in Ontario. Both the acute treatment and management of delayed neuropsychiatric sequelae fall within approved uses.
Study Limitations
This was a single-centre retrospective study from Taiwan with only 62 patients, making it difficult to generalize and control for all variables affecting DNS recovery.