Comment on: effects of emergency department length of stay on inpatient utilization and mortality
Abstract
Emergency department (ED) crowding is a persistent global challenge with well-documented consequences for patient outcomes and healthcare resource utilization. A recent study by Ma et al. reported that prolonged ED length of stay was associated with lower inpatient hospitalization costs, a finding that merits careful methodological scrutiny.We outline three considerations that may inform the interpretation of these findings. First, the aggregate cost of an admitted population is sensitive to its case-mix; hospitalization costs vary substantially across and within clinical services, and the relative proportion of admissions across departments, which the study does not report across length-of-stay strata, could materially affect the cost comparison; disentangling a true departmental effect from differences in case severity and procedure intensity would require risk-adjusted, standardized cost data. The cost outcome is further limited to inpatient charges, with ED costs unmeasured, yet the Discussion attributes lower costs among longer-stay patients to resource use shifting into the ED; because ED costs were not captured, this resource-shifting mechanism is asserted rather than demonstrated, and the pattern is equally consistent with a truncated or front-loaded inpatient work-up, differential case-mix, or survivorship effects given the concurrently higher mortality in the same strata. Second, comorbidity is operationalized as a binary variable, and the counterintuitive finding…
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