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Examining Length of Stay in 8-Hour Shifts

In previous research, studies have documented significant links between length of stay (LOS) over 24-hour periods and hospital occupancy, the number of ED admissions, and other factors. In the May 2012 Western Journal of Emergency Medicine, my colleagues and I published a study that looked at LOS in more discreet time periods than what earlier analyses have reported. We did this because ED crowding and volume can vary greatly during a given 24-hour period. We wanted to find out which factors were associated with LOS and whether this relationship was present during all or only specific 8-hour shifts. In our analysis, independent variables were measured during three 8-hour shifts. Shift 1 was from 7:00 am to 3:00 pm, shift 2 was from 3:00 pm to 11:00 pm, and shift 3 was from 11:00 pm to 7:00 am. For each shift, the numbers of ED nurses on duty, discharges, discharges on the previous shift, resuscitation cases, admissions and ICU admissions, and LOS on the previous shift, were measured. For each 24- hour period, the numbers of elective surgical admissions and hospital occupancy were measured, since these could not be measured in 8-hour time intervals. ED Length of Stay: Roles of Occupancy & Admissions On all three shifts, LOS increased by about 1 minute for each additional 1% increase in hospital occupancy. The mean hospital occupancy in our study was 94.9%; considering this high level of demand for inpatient beds, even a 1% increase in occupancy can lead to significant delays. The demand for inpatient beds often exceeds 100% capacity during the late morning and early afternoon hours on weekdays. To...
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