RESUMEN
To reduce overcrowding in emergency departments (ED), which is a serious international problem, it is important to reduce the length of ED stay (ED LOS) of emergency patients. In particular, due to the COVID 19 pandemic, psychiatric emergency patients spent much longer in ED. This study was conducted to identify the characteristics of psychiatric emergency patients who visited the ED during the COVID-19 pandemic and to identify factors affecting ED LOS. This retrospective study was conducted on adult patients aged 19 years or older who visited a psychiatric emergency center operated by an ED from 1 May 2020 to 31 April 2021 because of the COVID-19 pandemic. In this study, the average ED LOS of psychiatric emergency patients was 7.8 h. Factors affecting ED LOS for over 12 h were isolation (OR = 2.39, CI = 1.409-4.052), unaccompanied police officers (OR = 2.106, CI = 1.338-3.316), night-time visits (OR = 2.127, CI = 1.357-3.332), use of sedatives (OR = 1.671, CI = 1.030-2.713), and restraints (OR = 1.968, CI = 1.172-4.895). The ED LOS of psychiatric emergency patients is longer than that of general emergency patients, and a long ED LOS causes ED overcrowding. To reduce the ED LOS of psychiatric emergency patients, they must be accompanied by a police officer when visiting the ED, and the treatment process should be reorganized so that a psychiatrist can promptly intervene. Furthermore, it is necessary to reorganize the isolation guidelines and admission criteria for mental emergency patients.