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Difficulty: HardInitial Stabilization and Triage

Coworkers transport a 46-year-old farmhand to the emergency department after he collapsed in an orchard. They report that he was spraying crops earlier in the day when he suddenly developed severe shortness of breath, nausea, and vomiting. On arrival, the patient is agitated, diaphoretic, and in severe respiratory distress. Vital signs are temperature 36.8°C (98.2°F), pulse 42/min, blood pressure 86/54 mmHg, respirations 28/min, and oxygen saturation 84% on room air. Physical examination reveals profound salivation, lacrimation, and frothy sputum at the mouth. The pupils are 1 mm bilaterally. Pulmonary examination shows diffuse expiratory wheezing and coarse rhonchi in all lung fields. Neurologic examination is notable for generalized muscle fasciculations. Which of the following is the most urgent initial step in the stabilization of this patient?

  1. Administer intravenous atropine sulfateAnswer
  2. B
    Perform rapid sequence intubation using succinylcholine
  3. C
    Administer intravenous pralidoxime
  4. D
    Remove the patient's clothing and initiate dermal decontamination
  5. E
    Obtain a portable chest radiograph

Answer

Administer intravenous atropine sulfate
The correct answer is administering intravenous atropine sulfate. This patient presents with a classic cholinergic crisis due to organophosphate poisoning, characterized by severe muscarinic symptoms (miosis, salivation, bronchorrhea, bronchospasm, bradycardia) and nicotinic symptoms (muscle fasciculations). In this toxidrome, the immediate life-threatening issues are profound airway obstruction from copious secretions and respiratory failure from intense bronchospasm. The most urgent stabilization step is the rapid administration of atropine, a competitive muscarinic antagonist. It should be given immediately and aggressively titrated until airway secretions dry up and bronchospasm resolves. This pharmacologic intervention is paramount and essentially serves as the primary airway management maneuver for these patients.

Step-by-Step Solution

1
Recognize the clinical toxidrome based on the patient's presentation and occupational exposure.
The patient exhibits severe muscarinic (miosis, salivation, bronchorrhea, bronchospasm, bradycardia) and nicotinic (fasciculations) symptoms consistent with organophosphate poisoning.
Accurate identification of the underlying toxicological mechanism is necessary to select the correct life-saving antidote.
2
Identify the primary threats to the patient's life.
The patient is in acute respiratory failure and shock primarily due to profound bronchorrhea ('drowning in secretions'), intense bronchospasm, and severe bradycardia.
Initial stabilization must target the most immediate physiological threats to the airway, breathing, and circulation.
3
Select the appropriate initial stabilization intervention.
Intravenous atropine is selected to competitively antagonize muscarinic receptors.
Atropine dries the copious airway secretions, reverses bronchospasm, and improves the heart rate, effectively acting as the immediate airway and hemodynamic stabilization step before considering mechanical intubation.

Key Concept

In severe organophosphate poisoning, intravenous atropine is the most critical initial stabilization step to reverse life-threatening muscarinic effects (bronchorrhea, bronchospasm, bradycardia). Furthermore, rapid sequence intubation with succinylcholine is contraindicated due to inhibited plasma pseudocholinesterase.
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Topics

Initial Stabilization and Triage

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