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Zorluk: ZorInitial Stabilization and Triage

A 35-year-old woman is brought to the emergency department by emergency medical services after collapsing at a local seafood restaurant. Bystanders report that shortly after she began eating, she grasped her throat, developed a hoarse voice, and subsequently lost consciousness. Her past medical history is significant for poorly controlled asthma and allergic rhinitis, for which she uses an inhaled corticosteroid and a short-acting beta-agonist as needed.

Upon arrival, she is unresponsive to verbal stimuli but withdraws from painful stimuli.

Vital signs are:
Temperature: 37.1°C (98.8°F)
Blood pressure: 72/40 mmHg
Heart rate: 138/min
Respiratory rate: 32/min
Oxygen saturation: 84% on a non-rebreather mask

Physical examination reveals significant facial and periorbital edema. Lung auscultation demonstrates poor air movement bilaterally with prominent high-pitched inspiratory stridor and diffuse expiratory wheezes. Examination of the skin shows widespread raised, erythematous, intensely pruritic plaques across her trunk and extremities.

Which of the following is the most appropriate immediate next step in the stabilization of this patient?

  1. Intramuscular administration of epinephrineCevap
  2. B
    Endotracheal intubation using rapid sequence induction
  3. C
    Intravenous administration of diphenhydramine and methylprednisolone
  4. D
    Continuous nebulization of albuterol and ipratropium
  5. E
    Computed tomography scan of the neck and soft tissues

Cevap

Intramuscular administration of epinephrine
The correct answer is the immediate administration of intramuscular epinephrine. This patient is in severe anaphylactic shock, characterized by rapid-onset cardiovascular collapse (hypotension, unresponsiveness) and respiratory compromise (stridor, wheezing, hypoxemia) following exposure to a likely allergen (seafood). Epinephrine is the cornerstone of anaphylaxis management. Its alpha-1 adrenergic effects cause intense vasoconstriction, which reverses systemic vasodilation (treating shock) and decreases mucosal edema (relieving the upper airway obstruction causing her stridor). Its beta-2 adrenergic effects cause bronchodilation (relieving the lower airway wheezing) and stabilize mast cells to prevent further degranulation. It is the single most urgent step and must be administered immediately, often into the anterolateral thigh.

Adım Adım Çözüm

1
Analyze the clinical presentation and physical examination findings.
The patient exhibits sudden-onset unresponsiveness, hypotension, stridor, hypoxemia, and diffuse urticaria after a likely food allergen exposure.
Synthesizing these signs establishes a clinical diagnosis of severe systemic anaphylaxis with impending airway obstruction and distributive shock.
2
Prioritize the most immediate life-threatening pathophysiology.
The patient is experiencing simultaneous airway loss (laryngeal edema causing stridor) and cardiovascular collapse.
Identifying the dual threat highlights the need for an intervention that addresses both mucosal edema and vasodilation concurrently.
3
Determine the most appropriate immediate stabilization step.
Intramuscular epinephrine is selected as the primary and most urgent intervention.
Epinephrine provides rapid alpha-1 mediated vasoconstriction (increasing blood pressure and decreasing airway edema) and beta-2 mediated bronchodilation, stabilizing the patient before invasive airway measures are attempted.

Anahtar Kavram

In severe anaphylaxis presenting with shock and upper airway obstruction, intramuscular epinephrine is the absolute first-line stabilization step and should precede attempts at endotracheal intubation.
Tahmini Süre:1m 30s
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Initial Stabilization and Triage

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