As specialists in carbon monoxide (CO) poisoning, we noted with interest the paper in European Journal of Internal Medicine this year by Kao and co-workers examining the diagnosis of other diseases following an episode of CO poisoning [1]. It described a retrospective, population-based, cohort study utilizing the Taiwanese National Health Insurance Database. In essence, patients experiencing CO poisoning during a 13-year period were identified, matched to controls, and the database searched for subsequent new diagnoses that occurred in the CO-poisoned population in excess to those seen in the cohort.
