Influence of Overcrowding in the Emergency Department on Return Visit within 72 Hours.

This study was conducted to determine whether overcrowding in the emergency department (ED) affects the occurrence of a return visit (RV) within 72 hours. The crowding indicator of index visit was the average number of total patients, patients under observation, and boarding patients during the first 1 and 4 hours from ED arrival time and the last 1 h before ED departure. Logistic regression analysis was conducted to determine whether each indicator affects the occurrence of RV and post-RV admission. Of the 87,360 discharged patients, 3743 (4.3%) returned to the ED within 72 hours. Of the crowding indicators pertaining to total patients, the last 1 h significantly affected decrease in RV ( = 0.0046). Boarding patients were found to increase RV occurrence during the first 1 h ( = 0.0146) and 4 hours ( = 0.0326). Crowding indicators that increased the likelihood of admission post-RV were total number of patients during the first 1 h ( = 0.0166) and 4 hours ( = 0.0335) and evaluating patients during the first 1 h ( = 0.0059). Overcrowding in the ED increased the incidence of RV and likelihood of post-RV admission. However, overcrowding at the time of ED departure was related to reduced RV.