What are the typical signs and symptoms of diseases commonly encountered in emergency medical services (EMS)?

Signs and Symptoms of Common EMS Diseases

EMS providers most frequently encounter patients presenting with respiratory distress, chest pain, altered mental status, and signs of infection—these cardinal presentations require immediate recognition and systematic assessment to identify life-threatening conditions.

Cardiovascular Emergencies

Acute Myocardial Infarction (Heart Attack)

The classic presentation includes 1:

• Chest pain or pressure (most common)
• Shortness of breath
• Nausea
• Diaphoresis (sweating)
• Pain radiating to jaw, arm(s), or back

Critical caveat: Women, diabetics, and elderly patients frequently present atypically with 1:

• Dyspnea without chest pain
• Back, neck, jaw, or epigastric discomfort
• Lightheadedness
• Nausea without other symptoms

Research confirms chest pain is the leading chief complaint in EMS transports for heart failure patients, alongside respiratory problems 2. The prevalence of actual MI in chest pain patients varies dramatically by age: approximately 1% in 18-44 year-olds versus 4% in those ≥80 years 1.

Respiratory Emergencies

Breathing Difficulty/Dyspnea

This represents one of the most common and deadly EMS presentations 3, 4:

• Shortness of breath/dyspnea (most frequent respiratory symptom)
• Rapid respiratory rate (tachypnea)
• Use of accessory muscles
• Inability to speak in full sentences

The diagnostic complexity is substantial: Among patients calling EMS for breathing difficulty, 47.3% had respiratory diseases, but 13.4% had circulatory diseases and 12% had non-specific symptoms 3. The 30-day mortality for breathing difficulty patients reaches 13.2%, with highest early mortality in those with circulatory causes 3.

Chronic obstructive pulmonary disease (COPD) is the single most common final diagnosis in frequent EMS users presenting with dyspnea 4.

Neurological Emergencies

Stroke (Adult and Pediatric)

Altered mental status and neurological dysfunction are the strongest predictors of critical illness 5. For stroke specifically:

Adult presentations include:

• Facial drooping
• Arm weakness
• Speech difficulties
• Sudden onset symptoms

Pediatric stroke presents differently 1:

• Can mimic other childhood diseases
• May have gradual rather than sudden onset
• Common symptoms include headache, seizures, and focal neurological deficits
• Adult stroke scales are NOT validated in children and should not be solely relied upon 1

Altered Consciousness

This is a critical red flag across multiple conditions 5:

• Confusion or disorientation
• Decreased level of consciousness
• Slurred speech
• Associated with highest mortality rates (19.1% at 30 days when presenting with decreased consciousness) 3

Anaphylaxis

Life-threatening allergic reactions present with 1:

• Lip and facial swelling
• Sensation of throat closing
• Difficulty breathing
• Rash or hives
• Vomiting or diarrhea
• Signs of shock: altered consciousness, pallor, dizziness

Sepsis/Severe Infection

First aid providers should suspect infection when acute illness presents with ANY abnormal signs or symptoms 6. The 2024 guidelines emphasize nine categories of sepsis warning signs 6:

1. Temperature: Fever (≥38°C/100.4°F) OR hypothermia
2. Neurological: Confusion, dizziness, slurred speech
3. Musculoskeletal: Severe muscle pain, extreme shivering/rigors
4. Urologic: Lack of urination in 24 hours
5. Respiratory: Rapid breathing or breathlessness
6. Skin: Clammy/sweaty skin, nonblanching rash, mottled or discolored appearance
7. Cardiac: Elevated heart rate (tachycardia)
8. Gastrointestinal: Nausea, vomiting, diarrhea
9. Subjective: Feeling very unwell or sense of impending doom

Critical insight: Life-threatening infectious emergencies combine high fever with rapidly deteriorating general condition, hypotension, tachycardia, tachypnea, confusion, headache, or petechiae 7. Special risk factors include asplenia, immunosuppression, or recent tropical travel 7.

Common EMS Presentation Patterns

Research on frequent EMS users reveals the most common on-scene assessments 4:

1. Dyspnea (most common)
2. Chest pain (second most common)
3. Abdominal pain (third most common)

Importantly, 13% of frequent EMS users had potentially life-threatening conditions, but 22% of these had potentially inappropriate initial prehospital assessments 4. This underscores the diagnostic challenge in the field.

Critical Assessment Priorities

Rapid triage research identifies three sign/symptom categories most strongly associated with critical illness 5:

• Ventilation alterations (OR 6.09)
• Neurological dysfunction (OR 44.96)
• Pain (OR 5.80)

Additional high-priority findings include 5:

• Altered skin perfusion (25.3% of critical patients)
• Altered state of consciousness (35.2% of critical patients)

Key Clinical Pitfalls

1. Atypical presentations in vulnerable populations: Women, diabetics, and elderly patients with MI often lack classic chest pain 1

2. Pediatric stroke mimics: Children's strokes can present gradually and mimic other diseases; adult assessment tools fail in this population 1

3. Breathing difficulty complexity: Nearly half of dyspnea patients have non-respiratory causes, including cardiac disease 3

4. Sepsis recognition limitations: Even trained clinicians struggle with sepsis diagnosis; first aid providers should focus on recognizing infection with ANY abnormal signs rather than attempting sepsis diagnosis 6

5. Oxygen administration: While high-flow oxygen should generally be avoided in COPD patients, it must NOT be withheld when oxygen saturation is <88% 6