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Difficulty: MediumInitial Stabilization and Triage

A 24-year-old man is brought to the emergency department by emergency medical services after his roommate found him unresponsive in their apartment. Empty prescription bottles for amitriptyline and alprazolam were found on the nightstand. Upon arrival, the patient's blood pressure is 80/40 mmHg, heart rate is 132/min, respiratory rate is 8/min, and oxygen saturation is 88% on room air. He is unresponsive to verbal commands but moans in response to a sternal rub, corresponding to a Glasgow Coma Scale score of 6. His pupils are 6 mm and sluggishly reactive, and his skin is noticeably warm and dry. An electrocardiogram reveals sinus tachycardia with a QRS duration of 160 msec and a prominent terminal R wave in lead aVR. As he is being moved to the resuscitation bay, he develops a generalized tonic-clonic seizure. Which of the following are the most appropriate immediate next steps in the management of this patient? (Select all that apply)

  1. Administration of intravenous sodium bicarbonateAnswer
  2. Endotracheal intubationAnswer
  3. Administration of intravenous lorazepamAnswer
  4. D
    Computed tomography of the head without contrast
  5. E
    Administration of intravenous flumazenil

Answer

The most appropriate immediate steps are endotracheal intubation, administration of intravenous sodium bicarbonate, and administration of intravenous lorazepam.
This patient presents with a severe tricyclic antidepressant (TCA) overdose, characterized by anticholinergic symptoms, profound central nervous system depression, seizures, hypotension, and a widened QRS complex. The initial management of any critically ill toxicologic patient begins with the ABCs (Airway, Breathing, Circulation). Endotracheal intubation is definitively required to protect the airway and ensure adequate oxygenation in the setting of a low Glasgow Coma Scale score (6), hypoxia, and active seizures. Concurrent management of specific life-threatening complications is also necessary. Intravenous sodium bicarbonate is indicated to treat TCA-induced cardiotoxicity (evidenced by QRS >100 msec and hypotension) by overcoming the sodium channel blockade and alkalinizing the serum. Finally, intravenous lorazepam is the treatment of choice to rapidly abort TCA-induced seizures, which would otherwise severely exacerbate hypoxia and metabolic acidosis.

Step-by-Step Solution

1
Assess airway, breathing, and circulation (ABCs) in the unstable patient.
The patient has a compromised airway (GCS 6, moaning), hypoventilation (RR 8/min), hypoxia (SpO2 88%), and hemodynamic instability (BP 80/40 mmHg).
Immediate life threats must be identified and prioritized before diagnostic testing.
2
Perform immediate life-saving interventions for the ABCs.
Endotracheal intubation is indicated for definitive airway protection and mechanical ventilation.
The patient is unable to protect his airway, is hypoxic, and is actively seizing.
3
Identify the specific toxidrome and administer targeted antidotes for immediate threats.
The clinical picture and electrocardiogram (QRS 160 msec, terminal R wave in aVR) indicate severe TCA toxicity.
TCA-induced cardiac sodium channel blockade is life-threatening and requires prompt reversal with intravenous sodium bicarbonate to prevent lethal arrhythmias.
4
Treat life-threatening acute complications of the overdose.
The patient is having an active generalized tonic-clonic seizure.
Intravenous benzodiazepines (like lorazepam) are the first-line treatment to rapidly abort TCA-induced seizures, preventing further neurological damage and acidosis.

Key Concept

In patients with severe tricyclic antidepressant (TCA) overdose complicated by seizures and hemodynamic instability, priority is given to securing the airway, controlling active seizures with benzodiazepines, and stabilizing the cardiac membrane with sodium bicarbonate.
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Topics

Initial Stabilization and Triage

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