Objective
Regionalization may improve critical care delivery, yet stakeholders cite concerns about its feasibility. We sought to determine the operational effects of prehospital regionalization of non-trauma, non-arrest critical illness.
Design
Discrete event simulation study
Patients and setting
All 2006 hospital discharge data from King County, Washington, linked to all adult, eligible patients transported by county EMS agencies.
Methods
We simulated active triage of high-risk patients to designated referral centers using a validated prehospital risk score; we studied three regionalization scenarios: (1) up triage, (2) up & down triage, (3) up & down triage after reducing intensive care unit (ICU) beds by 25%. We determined the effect on patient routing, ICU occupancy at referral and non-referral hospitals, and EMS transport times.
Measurements and Main Results
119,117 patients were hospitalized at 11 non-referral centers and 76,817 patients were hospitalized at three referral centers. Among 20,835 EMS patients, 7,817 (43%) patients were eligible for up triage and 10,242 (57%) patients were eligible for down triage. At baseline mean daily ICU bed occupancy was 61% referral and 47% at non-referral hospitals. Up-triage increased referral ICU occupancy to 68%, up and down triage to 64%, and up and down triage with bed reduction to 74%. Mean daily non-referral ICU occupancy did not exceed 60%. Total EMS transport time increased by less than 3% with up and down triage.
Conclusions
Regionalization based on prehospital triage of the critically ill can allocate high-risk patients to referral hospitals without adversely affecting ICU occupancy or prehospital travel time.