The Heat Crisis: Managing Summer Surges in Arizona Emergency Departments
Analyzing the increasing strain on Arizona's emergency departments and first responders during the extreme heat of summer, and strategies for proactive patient management.
A Growing Public Health Emergency
Extreme heat is no longer just a feature of Arizona's climate; it is the state's most pressing seasonal public health crisis. In 2023, Maricopa County alone recorded 645 heat-related deaths, and 2024 saw similar figures. For emergency departments and urgent care centers, the months of June through September represent a sustained mass-casualty event that strains resources, staffing, and triage protocols. The volume of heat exhaustion and heat stroke cases frequently outpaces available cooling resources.
Beyond Direct Heat Illness
The impact on the healthcare system extends far beyond direct heat exposure (ICD-10 codes T67.x). Prolonged periods with temperatures exceeding 110°F exacerbate underlying chronic conditions. Cardiologists report spikes in ischemic events, nephrologists see surges in acute kidney injury due to chronic dehydration, and pulmonologists note increased COPD exacerbations linked to high ozone levels trapped by stagnant hot air. Providers across all specialties must adjust medication dosages (particularly diuretics and antihypertensives) and fluid management plans during the summer months.
The Vulnerable Populations
Data from our local health networks highlights clear demographic vulnerabilities. Unhoused individuals represent the most acutely at-risk population, accounting for nearly half of all heat-related fatalities. However, the elderly population (65+) is also disproportionately affected, often suffering indoors due to non-functional air conditioning or an inability to afford utility bills. Polypharmacy in this demographic further impairs thermoregulation. Pediatricians also report a steady stream of contact burns from pavement, playground equipment, and car seat fixtures.
Proactive Practice Management
For primary care and specialist practices, proactive patient management is critical to reducing emergency department admissions. Best practices emerging among AZDocs providers include initiating "heat checks" during spring visits—specifically reviewing medication lists for drugs that impair sweating (e.g., anticholinergics, antihistamines) or increase diuresis. Additionally, providing patients with clear, printed guidelines on recognizing the early signs of heat exhaustion versus heat stroke can significantly reduce morbidity.
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