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Difficulty: EasyInitial Stabilization and Triage

A 25-year-old woman is brought to the emergency department by a friend due to the sudden onset of difficulty breathing, throat tightness, and a diffuse itchy rash. Her symptoms began 15 minutes ago, shortly after she ate a peanut butter cookie at a local bakery. Vital signs show a temperature of 37.0°C (98.6°F), blood pressure of 82/50 mm Hg, pulse of 128/min, and respirations of 28/min. Oxygen saturation is 92% on room air. Physical examination reveals diffuse urticaria, facial edema, and bilateral expiratory wheezing. Which of the following is the most appropriate immediate next step in management?

  1. A
    Measurement of serum tryptase levels
  2. B
    Ordering a portable chest radiograph
  3. C
    Intravenous administration of diphenhydramine
  4. Intramuscular administration of epinephrineAnswer
  5. E
    Intravenous administration of methylprednisolone

Answer

Intramuscular administration of epinephrine
The correct answer is intramuscular administration of epinephrine. This patient is presenting with classic signs of severe anaphylaxis (hypotension, tachycardia, respiratory distress, and mucocutaneous signs) immediately following exposure to a known trigger. Epinephrine is the definitive first-line therapy because its potent alpha-adrenergic effects increase peripheral vascular resistance to reverse hypotension, while its beta-adrenergic effects induce bronchodilation and decrease the release of inflammatory mediators.

Step-by-Step Solution

1
Analyze the patient's clinical presentation and vital signs.
The patient has a history of allergen exposure followed by rapid onset of respiratory compromise (wheezing, throat tightness), skin involvement (urticaria, facial edema), and cardiovascular collapse (hypotension, tachycardia).
Recognizing the diagnostic criteria for anaphylaxis is critical for initiating appropriate emergency protocols.
2
Prioritize interventions based on the severity and acuity of the condition.
The most immediate threat to life is airway loss and distributive shock, requiring an intervention that rapidly reverses both.
In any acute stabilization scenario, life-saving ABC (Airway, Breathing, Circulation) interventions must take precedence over adjunctive therapies or diagnostic tests.
3
Select the optimal initial pharmacologic agent for anaphylaxis.
Epinephrine administered intramuscularly is identified as the single most critical and effective first-line therapy.
Epinephrine provides potent alpha-1 (vasoconstriction), beta-1 (inotropy/chronotropy), and beta-2 (bronchodilation) agonism, directly reversing the pathophysiology of anaphylaxis.

Key Concept

The absolute priority in the initial stabilization of anaphylaxis is the immediate intramuscular administration of epinephrine.
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Topics

Initial Stabilization and Triage

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