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Difficulty: MediumInitial Stabilization and Triage

Emergency medical services arrive at the emergency department with a 34-year-old woman experiencing sudden-onset respiratory distress and profound dizziness. The patient's symptoms started abruptly 20 minutes prior, shortly after consuming a meal at a local seafood restaurant. She is extremely anxious, struggling to breathe, and reporting a sensation of her throat closing. She has no known significant past medical history. Vital signs upon arrival are temperature 37.1°C (98.8°F), blood pressure 82/48 mm Hg, pulse 132/min, and respiratory rate 28/min. Oxygen saturation is 90% on room air. Physical examination demonstrates prominent facial angioedema, widespread erythematous urticarial plaques across her trunk, and diffuse expiratory wheezes on lung auscultation. She is speaking in short, fragmented sentences.

Which of the following interventions represent the most appropriate simultaneous initial steps in stabilizing this patient? (Select all that apply)

  1. Administer epinephrine intramuscularly into the anterolateral aspect of the thighAnswer
  2. Place large-bore intravenous catheters and infuse a rapid bolus of isotonic crystalloidsAnswer
  3. C
    Administer intravenous diphenhydramine and monitor for 15 minutes before escalating to other therapies
  4. D
    Order a computed tomography scan of the neck to definitively evaluate the extent of airway edema
  5. E
    Transfer the patient immediately to a general medical telemetry unit for continuous monitoring

Answer

The correct simultaneous interventions are administering intramuscular epinephrine into the anterolateral aspect of the thigh and placing large-bore intravenous catheters to infuse a rapid bolus of isotonic crystalloids.
This patient is presenting with anaphylactic shock, characterized by hypotension, respiratory distress, and mucocutaneous signs following food exposure. The immediate stabilization of anaphylaxis requires a multi-pronged approach targeting the airway and circulation. Intramuscular epinephrine (injected into the anterolateral thigh) is the paramount first-line therapy. It acts on alpha-1 receptors to induce vasoconstriction (increasing blood pressure and reducing mucosal edema) and on beta-2 receptors to induce bronchodilation. Concurrently, because anaphylaxis causes profound vasodilation and increased capillary permeability leading to massive intravascular volume depletion, establishing large-bore intravenous access and rapidly infusing isotonic crystalloids is a critical simultaneous step to restore adequate perfusion.

Step-by-Step Solution

1
Recognize the clinical presentation of anaphylactic shock.
The patient exhibits sudden-onset respiratory distress, angioedema, urticaria, and hypotension (82/48 mm Hg) after a likely allergen exposure.
Identifying the severity of the allergic reaction is crucial for immediate triage and resource allocation.
2
Prioritize initial life-saving interventions (ABCs).
Identify that the patient requires immediate reversal of airway compromise (bronchoconstriction, edema) and cardiovascular collapse (vasodilation, capillary leak).
Anaphylaxis causes rapid decompensation, mandating immediate pharmacologic and hemodynamic support.
3
Select the most appropriate concurrent stabilization orders.
Select intramuscular epinephrine as the primary pharmacologic therapy and rapid intravenous isotonic crystalloids for volume resuscitation.
Epinephrine provides rapid alpha-1, beta-1, and beta-2 adrenergic agonism. Isotonic crystalloids counteract the massive fluid shifts seen in anaphylactic shock.

Key Concept

Immediate stabilization of anaphylactic shock requires simultaneous administration of intramuscular epinephrine and rapid intravenous fluid resuscitation with isotonic crystalloids.
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Topics

Initial Stabilization and Triage

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