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Difficulty: HardInitial Stabilization and Triage

Emergency medical services arrive at the resuscitation bay with a gravid patient (estimated 34 weeks of gestation) in severe respiratory distress. The 31-year-old patient suddenly developed generalized pruritus, shortness of breath, and a feeling of impending doom while dining at a local seafood restaurant 30 minutes ago. On initial evaluation, she is lethargic. Physical examination reveals prominent periorbital swelling, diffuse raised erythematous plaques across her trunk, and loud inspiratory stridor. She is utilizing accessory muscles to breathe. Initial vital signs indicate a temperature of 37.0°C (98.6°F), profound hypotension at 70/40 mm Hg, marked tachycardia at 145/min, a respiratory rate of 30/min, and an oxygen saturation of 85% on room air. Concurrent with rapid intravenous fluid administration, which of the following are the most appropriate immediate steps in the stabilization of this patient? (Select 3)

  1. Intramuscular injection of epinephrineAnswer
  2. Preparation for endotracheal intubationAnswer
  3. Positioning the patient with a left lateral tiltAnswer
  4. D
    Intravenous administration of glucocorticoids and antihistamines
  5. E
    Computed tomography angiography of the chest

Answer

The most appropriate immediate steps are intramuscular injection of epinephrine, preparation for endotracheal intubation, and positioning the patient with a left lateral tilt.
This patient is presenting with severe anaphylaxis complicated by her third-trimester pregnancy. Initial stabilization requires a simultaneous, multi-faceted approach. First, the presence of inspiratory stridor indicates critical laryngeal edema, making preparation for advanced airway management (endotracheal intubation) an immediate priority before the airway is completely lost. Second, intramuscular epinephrine is the definitive first-line therapy for anaphylaxis, acting on α1\alpha_1- and β2\beta_2-receptors to reverse shock and airway swelling. Finally, in any pregnant patient over 20 weeks of gestation who is experiencing hemodynamic instability, placing the patient in a left lateral tilt (or providing manual left uterine displacement) is essential. This maneuver relieves aortocaval compression by the gravid uterus, thereby restoring venous return to the heart and improving cardiac output.

Step-by-Step Solution

1
Identify the primary pathophysiological process.
The patient is experiencing severe anaphylactic shock with impending airway compromise.
Symptoms began immediately after food exposure and include stridor, urticaria, and profound hypotension.
2
Address the imminent threat to the airway.
Prepare for immediate endotracheal intubation.
Audible stridor and accessory muscle use indicate severe laryngeal edema that will rapidly progress to complete airway obstruction.
3
Administer first-line pharmacological treatment.
Administer intramuscular epinephrine.
Epinephrine provides rapid α1\alpha_1- and β2\beta_2-adrenergic agonism to reverse systemic vasodilation, hypotension, and bronchoconstriction.
4
Optimize hemodynamics considering the patient's physiological state.
Apply a left lateral tilt.
At 34 weeks of gestation, the gravid uterus compresses the inferior vena cava when supine. A left lateral tilt restores venous return, maximizing the efficacy of resuscitative efforts.

Key Concept

Simultaneous execution of airway securement, first-line pharmacological intervention (epinephrine), and pregnancy-specific positional resuscitation (left lateral tilt) is required for pregnant patients presenting with decompensated anaphylactic shock.
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Topics

Initial Stabilization and Triage

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