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Difficulty: HardInitial Stabilization and Triage

Friends hastily transport a 28-year-old male to the trauma and resuscitation bay after he abruptly developed severe respiratory distress and facial swelling during a seafood dinner. Upon arrival, the patient is clutching his throat, phonating only in single words, and exhibiting marked periorbital edema along with swollen lips. He has no known medical conditions and takes no daily medications. Initial vital signs reveal a temperature of 37.0°C (98.6°F), blood pressure of 76/40 mm Hg, heart rate of 142/min, respiratory rate of 32/min, and oxygen saturation of 86% on room air. Auscultation of the neck and chest demonstrates a high-pitched inspiratory sound and widespread expiratory wheezing. His skin is warm, hyperemic, and covered with raised, pruritic plaques. Which of the following interventions must be initiated simultaneously for the immediate stabilization of this patient? (Select all that apply.)

  1. Intramuscular injection of epinephrine in the anterolateral thighAnswer
  2. Rapid intravenous infusion of isotonic crystalloidAnswer
  3. Application of high-flow oxygen via a nonrebreather maskAnswer
  4. D
    Intravenous administration of diphenhydramine and ranitidine
  5. E
    Immediate measurement of serum tryptase and histamine levels
  6. F
    Prompt acquisition of a portable chest radiograph

Answer

The correct immediate stabilization steps are the intramuscular injection of epinephrine, rapid intravenous infusion of isotonic crystalloid, and application of high-flow oxygen.
The clinical presentation of severe hypotension, hypoxia, stridor (indicating laryngeal edema), and diffuse urticaria shortly after seafood ingestion is classic for severe anaphylaxis. Anaphylaxis is a life-threatening, IgE-mediated hypersensitivity reaction that demands immediate, simultaneous stabilization of the airway, breathing, and circulation. The primary life-saving intervention is the intramuscular injection of epinephrine, which rapidly stimulates alpha-1 receptors to reverse peripheral vasodilation and beta-2 receptors to dilate the airways. Concurrently, the profound distributive shock caused by massive capillary leak must be addressed with aggressive volume resuscitation using intravenous isotonic crystalloids. Additionally, given the patient's critical hypoxia and impending airway compromise, the application of high-flow oxygen is a mandatory simultaneous step to maximize tissue oxygenation while pharmacologic therapies begin to take effect.

Step-by-Step Solution

1
Evaluate the patient's primary survey and vital signs.
The patient demonstrates severe respiratory distress, stridor, significant hypoxia (SpO2 86%), and profound hypotension (76/40 mm Hg).
Identifying immediate airway compromise and shock establishes the absolute priority of life-saving resuscitative measures over diagnostic workup.
2
Recognize the specific clinical syndrome causing the instability.
The combination of sudden-onset shock, upper airway obstruction, wheezing, and widespread urticaria following a high-risk allergen exposure indicates severe anaphylaxis.
Accurate and rapid clinical diagnosis is essential because anaphylactic shock requires specific, immediate pharmacologic reversal.
3
Determine the necessary simultaneous stabilization orders.
The patient requires immediate intramuscular epinephrine, aggressive intravenous fluid resuscitation, and high-flow oxygen.
Epinephrine reverses vasodilation and bronchoconstriction, isotonic fluids treat the profound distributive shock, and oxygen addresses the critical hypoxia.

Key Concept

Initial stabilization of severe anaphylaxis requires the simultaneous administration of intramuscular epinephrine, aggressive intravenous fluid resuscitation, and supplemental oxygen before any diagnostic testing or secondary adjunctive therapies.
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Topics

Initial Stabilization and Triage

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