Effect of a Multi-Diagnosis Observation Unit on Emergency Department Length of Stay and Inpatient Admission Rate at Two Canadian Hospitals.
BACKGROUND
Observation units (OUs) have been shown to reduce emergency department (ED) lengths of stay (LOS) and admissions. Most published studies have been on OUs managing single complaints.


OBJECTIVE
Our aim was to determine whether an OU reduces ED LOS and hospital admission rates for adults with a variety of presenting complaints.


METHODS
We comparatively evaluated two hospitals in British Columbia, Canada (hereafter ED A and ED B) using a pre-post design. Data were extracted from administrative databases. The post-OU cohort included all adults presenting 6 months after OU implementation. The pre-OU cohort included all adults presenting in the same 6-month period 1 year before OU implementation.


RESULTS
There were 109,625 patient visits during the study period. Of the 56,832 visits during the post-OU period (27,512 to ED A and 29,318 to ED B), 1.9% were managed in the OU in ED A and 1.4% in ED B. Implementation was associated with an increase in the median ED LOS at ED A (179.0 min pre vs. 192.0 min post [+13.0 min]; p < 0.001; mean difference -12.5 min, 95% confidence interval [CI] -15.2 to -9.9 min), but no change at ED B (182.0 min pre vs. 182.0 min post; p = 0.55; mean difference +2.0 min, 95% CI -0.7 to +4.7 min). Implementation significantly decreased the hospital admission rate for ED A (17.8% pre to 17.0% post [-0.8%], 95% CI -0.18% to 0.15%; p < 0.05) and did not significantly change the hospital admission rate at ED B (18.9% pre to 18.3% post [-0.6%], 95% CI -1.19% to -0.09%; p = 0.09).


CONCLUSIONS
A multi-diagnosis OU can reduce hospital admission rate in a site-specific manner. In contrast to previous studies, we did not find that an OU reduced ED LOS. Further research is needed to determine whether OUs can reduce ED overcrowding.
Department of Emergency Medicine, University of British Columbia, Vancouver General Hospital, Vancouver, British Columbia, Canada.
Amy H Y
AHY
Cheng
Department of Emergency Medicine, University of British Columbia, Vancouver General Hospital, Vancouver, British Columbia, Canada.
Neil G
NG
Barclay
Department of Emergency Medicine, University of British Columbia, Vancouver General Hospital, Vancouver, British Columbia, Canada.
Riyad B
RB
Abu-Laban
D000328:Adult; D000368:Aged; D001955:British Columbia; D004636:Emergency Service, Hospital / Q000458:organization & administration*; D005260:Female; D006757:Hospital Units / Q000706:statistics & numerical data*; D006801:Humans; D065186:Interrupted Time Series Analysis; D007902:Length of Stay / Q000706:statistics & numerical data*; D008297:Male; D008875:Middle Aged; D019370:Observation; D010343:Patient Admission / Q000706:statistics & numerical data*
admission rates; clinical decision units; diagnostic treatment units; emergency department; length of stay; observation unit; overcrowding