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Abstract
Primary objective: To assess cognitive sequelae, depression and anxiety following carbon monoxide (CO) poisoning.
Research design: Prospective cohort study.
Methods and procedures: This study prospectively followed 256 patients, 55 with less severe and 201 with more severe CO-poisoning. The prevalence of cognitive sequelae, depression and anxiety at 6 weeks, 6 months and 12 months was compared in patients with less severe and more severe CO-poisoning.
Main outcomes and results: Of the less severe CO-poisoned patients, 39% had cognitive sequelae, 21% depression and 30% anxiety at 6 weeks. Of the more severe CO-poisoned patients, 35% had cognitive sequelae, 16% depression and 11% anxiety at 6 weeks. There was no difference in the prevalence of cognitive sequelae at any time. The prevalence of depression was higher in patients with less compared with more severe CO-poisoning at 6 months (p= 0.04), but not 6 weeks or 12 months. The prevalence of anxiety was higher in patients with less compared to more severe CO-poisoning at 6 weeks (p= 0.008), but not 6 or 12 months. Anxiety decreased over time in the less severe group (p< 0.01).
Conclusion: CO-related cognitive sequelae, depression and anxiety are common and may be independent of poisoning severity.