[Comments on the article "Incidence and factors associated with delirium in an Emergency Department"].

Changes in cognition, attention, consciousness, and perception rapidly occurring and unpredictably evolving are the distinctive hallmarks of delirium syndrome. In Mexico the incidence is reported to be 12%. In our study, subject of the quoted letter to the editor, there were included 169 patients over 65 years of age, to which the Confusion Assessment Method (CAM) questionnaire was administered upon admission to the Emergency Department and 24 hours after admission to confirm or exclude a diagnosis of delirium. An incidence of 43.8% was reported, with no statistically significant association found with patient factors (such as infection, substance abuse, or comorbidities).