Review Article
Emergency Department Crowding: Time for Interventions and Policy Evaluations
Table 2
A consensus definition of emergency department crowding [
42].
| Input measures | |
| (1) Ability of ambulances to offload | | An ED is crowded when the 90th percentile time between ambulance arrival and offload is greater than 15 minutes. | | (2) Patients who leave without being seen or treated (LWBS) | | An ED is crowded when the number of patients who LWBS is greater than or equal to 5%. | | (3) Time until triage | | An ED is crowded when there is a delay greater than 5 minutes from the time of patient arrival to the begining of their initial triage. | |
| Throughput measures | |
| (4) ED occupancy rate | | An occupancy rate is the total volume of patients in the ED compared to the total number of officially designated ED treatment | | spaces. An ED is crowded when the occupancy rate is greater than 100%. | | (5) Patients’ total length of stay in the ED | | An ED is crowded when the 90th percentile patient’s; total length of stay is greater than 4 hours. | | (6) Time until a physician first sees the patient | | An ED is crowded when an emergent patient waits longer than 30 minutes to be seen by a physician. | |
| Output measures | |
| (7) ED boarding time | | An ED is crowded when less than 90% of patients have left the ED 2 hour after the admission decision. | | (8) Number of patients boarding in the ED | | Boarders are defined as admitted patients waiting to be placed in an inpatient bed. An ED is crowded when there is greater than | | 10% occupancy of boarders in the ED. | |
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