Effect of Emergency Department Overcrowding on the Outcome of Patient Care: A pilot study

ABSTRACT

PURPOSE: This study was designed to evaluate the effect of emergency department (ED) overcrowding on the outcome of patient care. METHODS: A retrospective review of medical records was obtained from Order Communicating System in the adult ED at a tertiary care teaching hospital from September 1, 2001 to November 30, 2001. For the overcrowding index, the length of stay in the ED and the time from registration to order were calculated. The outcome was defined as the result of care done in the ED or during hospitalization. The overcrowding effect on the outcome was tested by using a multivariate logistic regression analysis. Compared with the survival group, the odds ratio (OR) and 95% confidence interval (95% CI) of the death group was calculated with adjustments for gender, age, arrival time in the ED, arrival day of the week, clinical department, operation, hospitalization in the intensive care unit, and injury or disease. RESULTS: The number of total cases was 5,852. Of these, 3,046 was males and 2,806 females. Of these, the number of mortality cases in the ED was 106. A total of 2,025 patients were hospitalized. Of all the hospitalization cases, 161 died on the ward in spite of management. The length of stay in the ED, and adjusted OR were significantly increased in the total death cases and in the death cases on the ward compared to those of the survival cases. For time, from registration to order above 10 minute, compared to those below 10 minute, the adjusted OR for death in the ED was significantly increased. CONCLUSION: The overcrowding indices, such as the length of stay or the time from registration to order, were related with the outcome, that is, total death and death in the ED or on the ward.