A 24-year-old man is brought to the emergency department after being stung by a bee. Within minutes, he developed generalized urticaria, wheezing, and a tightness in his throat. On arrival, he is tachypneic and leaning forward. His voice is barely audible, and he has loud inspiratory stridor. He is hypotensive at 90/50 mmHg and tachycardic with a pulse of 125/minute. Despite receiving an initial dose of intramuscular epinephrine in the field, his stridor is worsening and he is becoming increasingly lethargic.
Which of the following is the most appropriate next step in the management of this patient's airway?
The correct answer is:
B) Endotracheal intubation with a smaller-than-standard tube
This patient is in anaphylactic shock with impending airway obstruction from laryngeal edema. When a patient shows signs of progressive airway compromise, such as stridor, muffled voice, and accessory muscle use, despite initial epinephrine, definitive airway management must not be delayed. In the setting of laryngeal edema, the airway is physically narrowed by swollen soft tissue. Therefore, endotracheal intubation should be attempted early, preferably using a smaller-than-standard endotracheal tube to navigate the narrowed glottic opening. This should ideally be performed by the most experienced clinician available, often with a video laryngoscope or fiberoptic assistance.
Answer choice A: Administration of nebulized racemic epinephrine, is incorrect. While this can temporarily reduce mucosal edema in conditions like croup, it is not definitive treatment for the systemic, rapidly progressing edema of anaphylaxis and should not delay intubation.
Answer choice C: Immediate surgical cricothyroidotomy, is incorrect. A surgical airway is the final step in a cannot intubate, cannot oxygenate scenario. While the clinician should be prepared for this, a controlled attempt at intubation is the preferred first-line approach for securing the airway.
Answer choice D: Intravenous diphenhydramine and methylprednisolone, is incorrect. These are adjunctive treatments. Antihistamines do not treat the life-threatening physiological changes of anaphylaxis such as hypotension and airway edema, and steroids take hours to work. They should never delay airway intervention or epinephrine.
Answer choice E: Repeat intramuscular epinephrine in the contralateral thigh, is incorrect. While repeat doses of epinephrine are indicated every 5–15 minutes if symptoms persist, this patient is already showing signs of imminent airway failure, including lethargy and worsening stridor. At this stage, securing the airway takes precedence over further pharmacological temporization.
Key Learning Point
In anaphylaxis-induced laryngeal edema, early intubation is critical because the edema is progressive. Waiting until the airway is lost makes intubation significantly more difficult or impossible.
