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| Medical Priority Dispatch System | |
|---|---|
| Name | Medical Priority Dispatch System |
| Caption | Dispatch center console |
| Type | Emergency medical dispatch protocol |
| Founded | 1970s |
| Founder | Jeff Clawson |
| Location | Salt Lake City, Utah |
| Area served | International |
| Key people | Jeff Clawson, Nancy Caroline |
Medical Priority Dispatch System
The Medical Priority Dispatch System is a standardized emergency medical dispatch protocol used by 911 (emergency telephone number) centers, emergency medical services agencies, and ambulance service providers to prioritize pre-hospital care and assign resources. Developed by Jeff Clawson with contributions from Nancy Caroline and other educators, the system integrates scripted questioning, determinant codes, and pre-arrival instructions to coordinate responses among public safety answering points, dispatch centers, and clinical oversight bodies. It is utilized by municipal services, private providers, and national systems across North America, Europe, Asia, and Australia.
The system originated in the 1970s from research into # of dispatch outcomes and the need for standardized triage at Salt Lake City. Jeff Clawson refined protocols through collaboration with physicians such as Nancy Caroline, and organizations including National Association of EMS Physicians and American College of Emergency Physicians. Early adopters included municipal services in Salt Lake City and New York City, followed by international implementation in countries like Canada, United Kingdom, Australia, and New Zealand. Over decades, updates responded to evidence from studies by institutions like Harvard Medical School, Johns Hopkins University, and University of Pennsylvania improving algorithms and adding pre-arrival instructions and dispatcher-assisted cardiopulmonary resuscitation protocols.
The system is organized into condition-specific "protocols" or "cards" covering chief complaints (e.g., breathing problems, chest pain, trauma). Protocol development involved panels from American Heart Association, World Health Organization, and specialty groups such as Society for Critical Care Medicine. Protocols are coded by category and determinant levels to standardize response across agencies including Fire Department of New York, Los Angeles County Fire Department, and private ambulance firms like AMR (company). The framework supports integration with computer-aided dispatch platforms from vendors such as Intermedix, TriTech Software Systems, and Spillman Technologies.
Emergency medical dispatch (EMD) call-taking follows scripted interrogation to identify chief complaint, level of consciousness, and life threats. Dispatchers at public safety answering points use protocol cards referencing International Academy of Emergency Dispatch standards, applying determinant codes and pre-arrival instructions like dispatcher-assisted CPR. Call links to resource allocation for entities such as Boston EMS, Seattle Fire Department, or provincial services like Ontario Provincial Police when crossover occurs. Supervisory medical directors from organizations like Royal College of Physicians or hospital systems guide quality assurance and case review.
Priority levels are determined using determinant codes that combine complaint-based protocols with modifiers (age, comorbidities, mechanism of injury). Determinant criteria align with clinical guidance from American College of Surgeons trauma triage, European Resuscitation Council guidelines, and specialty societies including American Thoracic Society. Prioritization influences response time targets adopted by services such as Chicago Fire Department and Toronto Paramedic Services, and may be audited by accreditation bodies like Commission on Accreditation of Ambulance Services.
Dispatch codes (e.g., Alpha, Bravo, Charlie, Delta, Echo in some systems) map to resource packages: basic life support (BLS), advanced life support (ALS), helicopter emergency medical services (HEMS) and multi-unit responses. Resource decisions reference capacities of providers like MedEvac, Hatzalah, and municipal fleets in cities such as Philadelphia and Houston. Integration with mutual aid compacts, strike teams, and disaster plans involving agencies like Federal Emergency Management Agency or National Health Service systems allows scaling during mass-casualty incidents or public health emergencies.
Dispatcher training combines classroom, simulator, and continuing education components administered by certifying organizations such as the International Academy of Emergency Dispatch. Accreditation programs and certification exams involve standards from National Association of Emergency Medical Technicians and regional regulators like Health and Care Professions Council in the United Kingdom. Training emphasizes quality assurance, call review methodologies employed by centers like King County EMS, and scenario-based competency assessments informed by research from Cleveland Clinic and academic centers.
Critics cite concerns about sensitivity and specificity of scripted protocols in detecting conditions like acute coronary syndrome or stroke; peer-reviewed evaluations by researchers at University of Glasgow, University of Toronto, and Imperial College London report variable predictive values. Other critiques involve dispatcher workload, language barriers in multicultural cities such as Los Angeles and London, and the risk of overtriage increasing system strain noted in studies from University of California, San Francisco and Monash University. Performance studies focus on response time metrics, clinical outcomes, and cost-effectiveness, often comparing determinant-based dispatch with physician-led triage models trialed at institutions like Karolinska Institute and Mayo Clinic.