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Difficulty: HardInitial Stabilization and Triage

A 22-year-old man is brought to the emergency department by paramedics after his roommate found him unresponsive. Empty bottles of amitriptyline and alprazolam were found on his nightstand. On arrival, the patient is obtunded and responds only to deep painful stimuli.

Vital signs are:
- Temperature: 38.2°C (100.8°F)
- Blood pressure: 82/50 mmHg
- Heart rate: 135/min
- Respiratory rate: 8/min
- Oxygen saturation: 86% on room air

Physical examination reveals dry mucous membranes, dilated pupils bilaterally, and absent bowel sounds. A 12-lead ECG demonstrates sinus tachycardia with a QRS duration of 150 ms and a prominent terminal R wave in lead aVR. Which of the following is the most urgent initial step in the stabilization of this patient?

  1. Endotracheal intubationAnswer
  2. B
    Intravenous administration of sodium bicarbonate
  3. C
    Intravenous administration of flumazenil
  4. D
    Administration of activated charcoal via a nasogastric tube
  5. E
    Computed tomography of the head without contrast

Answer

Endotracheal intubation is the most urgent initial step to secure the patient's airway and ensure adequate ventilation.
The correct answer is endotracheal intubation. This patient presents with an acute mixed overdose involving amitriptyline (a tricyclic antidepressant) and alprazolam (a benzodiazepine). His clinical presentation—obtundation, profound hypoventilation (respiratory rate of 8/min), and hypoxia (oxygen saturation of 86%)—indicates impending respiratory failure and an inability to protect his airway. In all emergency resuscitations, the fundamental algorithm of Airway, Breathing, and Circulation (ABCs) dictates the sequence of care. Before addressing the specific cardiotoxic effects of the TCA overdose with sodium bicarbonate, the physician must first secure the airway via endotracheal intubation to prevent anoxic brain injury, respiratory arrest, and aspiration. Once the airway is secured and ventilation is established, specific antidotal therapies can be safely administered.

Step-by-Step Solution

1
Assess the patient's vital signs and primary physiologic threat.
The patient exhibits profound hypoventilation (RR 8/min), hypoxia (SpO2 86%), and an inability to protect his airway (obtunded, responding only to deep pain).
Identifying immediate life-threats dictates the first step in resuscitation algorithms.
2
Recognize the underlying toxidrome from the clinical presentation and ECG.
The combination of anticholinergic signs (dry mucous membranes, dilated pupils), empty amitriptyline bottles, and a wide QRS complex with a prominent terminal R wave in aVR confirms severe tricyclic antidepressant (TCA) toxicity.
Understanding the toxicity helps anticipate complications (arrhythmias, seizures) and select appropriate secondary therapies.
3
Prioritize interventions based on the Airway, Breathing, Circulation (ABCs) framework.
Despite the severe cardiac toxicity necessitating sodium bicarbonate, securing the airway (intubation) must take absolute precedence over antidotal therapy.
Administering antidotes will not reverse acute asphyxiation or prevent aspiration of gastric contents in an unprotected airway.

Key Concept

In the initial stabilization of any critically ill patient, including those with severe toxicologic emergencies, securing the airway and ensuring adequate ventilation (ABCs) must always precede the administration of specific antidotes.
Estimated Time:1m 15s
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Topics

Initial Stabilization and Triage

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