Journal of Healthcare Engineering / 2019 / Article / Tab 2

Research Article

Planning Capacity for Mental Health and Addiction Services in the Emergency Department: A Discrete-Event Simulation Approach

Table 2

Input parameters in the simulation model.


Interarrival ratesExponential distribution fit to historical ED arrival dataInterarrival rate distributions were separately created for the NMHA group and each MHA subgroup: substance abuse, schizophrenia, mood, anxiety, and others
Flow paths and proportionsCalculated from historical dataProportions of patients in each acuity level (CTAS 1 to 5) were calculated. For each acuity level, proportions of each discharge disposition were also computed (i.e., discharged, admitted, internal transfer, external transfer, and left/death)
ED bed requirementLogNormal distribution and average values fit to historical ED LOS dataSeparate distributions were created for each acuity and discharge disposition combination
ED bed capacitySupplied by ED manager32 beds
PESU bed capacitySupplied by PESU manager6 beds
PESU LOSTriangular distribution supplied by PESU managerMinimal data were available, so estimates were used and validated by the PESU manager

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