Nakajima M, et al. - Researchers examined the effects of hyperbaric oxygen therapy (HBOT) on carbon monoxide (CO) poisoning. In addition, they sought to delineate its inherent effects on specific subgroups of patients using a nationwide inpatient database. Adult patients with CO poisoning who were registered in the Japanese Diagnosis Procedure Combination inpatient database from 2010 to 2016 were identified. Despite no significant association of HBOT with reduced mortality, they noted it to be associated with a favorable consciousness level and activities of daily living (ADL) in patients with CO poisoning. This indicates HBOT as beneficial even for patients with non-severe CO poisoning.