Analyzing the ED Visits
Overtriaged cases were ESI level 1 or 2 cases in which fewer than 2 resources were used; level 3 cases where fewer than 2 resources were used and no level 1 or 2 events occurred; and level 4 cases where no resources were used.
Undertriaged cases were defined as the following:
- ESI level 5 cases where any resource was used and any level 1, 2, or 3 events occurred.
- Level 4 cases where more than 1 resource was used and any level 1, 2, or 3 events occurred.
- Level 3 cases where any level 1 event occurred, more than one level 2 event occurred, or any level 2 event occurred and more than one additional ED resource type was used.
- Level 2 cases where any level 1 event occurred.
About half the visits (51%) were assigned ESI 3, which was the category with the highest proportion of mistriage. After adjusting for study facility and triage vital signs, the researchers found that children age 6 and older were more likely to be undertriaged than those younger than 6, particularly those age 15 and older (relative risk [RR], 1.36).
Undertriage was also modestly more likely with male patients (female patients’ RR, 0.93), patients with comorbidities (RR, 1.11-1.2), patients who arrived by ambulance (RR, 1.04), and patients who were Asian (RR, 1.10), Black (RR, 1.05), or Hispanic (RR, 1.04). Undertriage became gradually less likely with each additional year in the study period, with an RR of 0.89 in 2019 and 2020.
Among the study’s limitations were use of ESI version 4, instead of the currently used 5, and the omission of common procedures from the outcome definition that “may systematically bias the analysis toward overtriage,” the editorial noted. The authors also did not include pain as a variable in the analysis, which can often indicate patient acuity.
Further, this study was unable to include covariates identified in other research that may influence clinical decision-making, such as “the presenting illness or injury, children with complex medical needs, and language proficiency,” Dr. Frankenberger and colleagues wrote. “Furthermore, environmental stressors, such as ED volume and crowding, can influence how a nurse prioritizes care and may increase bias in decision-making and/or increase practice variability.”
The study was funded by the Kaiser Permanente Northern California (KPNC) Community Health program. One author had consulting payments from CSL Behring and Abbott Point-of-Care, and six of the authors have received grant funding from the KPNC Community Health program. The editorial authors reported no conflicts of interest.