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Difficulty: HardInitial Stabilization and Triage

Emergency medical responders arrive at the resuscitation bay with a 28-year-old male who was found unconscious by his flatmate. Several empty pill bottles, including amitriptyline and diphenhydramine, were recovered from his bedroom. Initial vital signs show a blood pressure of 82/48 mm Hg, heart rate of 138/min, respiratory rate of 8/min, and oxygen saturation of 90% on ambient air. The patient makes incomprehensible sounds, does not open his eyes to painful stimuli, and exhibits abnormal flexion in his upper extremities. His skin is notably hot, flushed, and dry, and bilateral pupils measure 7 mm with sluggish reactivity. An immediate 12-lead electrocardiogram reveals sinus tachycardia with a QRS duration of 155 ms and a prominent terminal R wave in lead aVR. Which of the following interventions represent the most critical immediate stabilization steps for this patient? (Select exactly 3 options)

  1. Endotracheal intubationAnswer
  2. Administration of intravenous sodium bicarbonateAnswer
  3. Administration of an intravenous isotonic crystalloid bolusAnswer
  4. D
    Intravenous administration of physostigmine
  5. E
    Immediate transport for a non-contrast head computed tomography scan
  6. F
    Intravenous administration of flumazenil

Answer

The most appropriate immediate stabilization steps are endotracheal intubation, administration of an intravenous isotonic crystalloid bolus, and administration of intravenous sodium bicarbonate.
The patient presents with life-threatening tricyclic antidepressant (TCA) toxicity, characterized by an anticholinergic toxidrome, severe central nervous system depression, hypotension, and cardiotoxicity. Effective initial stabilization requires a multipronged approach. First, the patient's Glasgow Coma Scale score is 6, which mandates definitive airway protection via endotracheal intubation to prevent aspiration and manage hypoventilation. Second, his profound hypotension requires immediate volume expansion with an intravenous isotonic crystalloid bolus. Third, the QRS interval of 155 ms signifies severe myocardial sodium channel blockade. Intravenous sodium bicarbonate is the critical stabilization step to narrow the QRS complex, enhance sodium gradient across the myocardium, and prevent fatal arrhythmias like ventricular tachycardia or fibrillation.

Step-by-Step Solution

1
Assess airway and breathing capabilities based on the patient's neurologic status.
The patient exhibits a Glasgow Coma Scale (GCS) score of 6 (Eyes 1, Verbal 2, Motor 3) and a respiratory rate of 8/min.
A GCS score of less than 8 combined with hypoventilation dictates the immediate need for endotracheal intubation to secure the airway and ensure adequate ventilation.
2
Evaluate hemodynamic status and initiate circulatory support.
The patient presents with profound hypotension (82/48 mm Hg).
Intravenous isotonic crystalloids must be rapidly infused as the first-line treatment for hypotension before initiating vasopressors.
3
Identify specific toxicological threats requiring immediate targeted antidotal stabilization.
The electrocardiogram shows a QRS duration of 155 ms in the setting of suspected tricyclic antidepressant (TCA) overdose.
A QRS duration greater than 100 ms in TCA toxicity is a predictor of life-threatening ventricular arrhythmias, necessitating immediate intravenous sodium bicarbonate to overcome sodium channel blockade.

Key Concept

In complex toxicological presentations, initial stabilization must simultaneously address the ABCs (Airway, Breathing, Circulation) alongside time-sensitive, life-saving antidotal therapies while avoiding diagnostic delays or contraindicated medications.
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Topics

Initial Stabilization and Triage

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