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Difficulty: HardPhysiological Adaptation

An unresponsive client with a known history of severe hypothyroidism is brought to the emergency department by paramedics. Initial assessment reveals a core body temperature of 94.2°F (34.6°C), a heart rate of 46/min, a blood pressure of 80/48 mm Hg, and shallow respirations at 8/min. Arterial blood gas analysis demonstrates a pH of 7.24, PaCO2 of 58 mm Hg, HCO3 of 24 mEq/L, and PaO2 of 62 mm Hg. Which of the following is the priority nursing action?

  1. Prepare the client for immediate endotracheal intubation and mechanical ventilationAnswer
  2. B
    Administer intravenous levothyroxine as prescribed
  3. C
    Apply forced-air warming blankets to rapidly elevate the core body temperature
  4. D
    Administer an intravenous bolus of sodium bicarbonate

Answer

Prepare the client for immediate endotracheal intubation and mechanical ventilation
The correct action is to prepare the client for immediate endotracheal intubation and mechanical ventilation. The client is experiencing myxedema coma characterized by severe respiratory depression (respiratory rate of 8/min). The ABG reveals uncompensated respiratory acidosis (pH 7.24, PaCO2 58 mm Hg) and hypoxemia. Following the ABCs of nursing prioritization, securing the airway and restoring adequate ventilation is the absolute highest priority to prevent cardiopulmonary arrest.

Step-by-Step Solution

1
Interpret the physical assessment findings and vital signs.
The client exhibits profound bradycardia, hypotension, hypothermia, and hypoventilation, indicative of a life-threatening myxedema coma.
Recognizing the systemic decompensation directs the urgency of the clinical response.
2
Analyze the arterial blood gas (ABG) results.
The ABG shows a pH of 7.24 (acidosis), PaCO2 of 58 mm Hg (respiratory origin), and normal HCO3 (uncompensated), diagnosing acute respiratory failure.
Correct interpretation of ABGs determines whether the primary crisis is metabolic or respiratory, dictating the specific intervention.
3
Apply the airway, breathing, and circulation (ABC) prioritization framework.
Airway and breathing compromise (RR of 8/min, PaCO2 of 58 mm Hg) present the most immediate threat to the client's life.
Airway management and mechanical ventilation must be established before correcting the underlying endocrine deficit or addressing temperature.

Key Concept

Prioritization and Stabilization in Endocrine Emergencies (Myxedema Coma)
Estimated Time:1m 30s
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Topics

Physiological Adaptation

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