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Difficulty: HardPhysiological Adaptation

A nurse is reviewing the plan of care for a client diagnosed with myxedema coma. The client presents with a core body temperature of 34.2∘C34.2^\circ\text{C} (93.6∘F93.6^\circ\text{F}), a blood pressure of 86/52 mm Hg86/52\text{ mm Hg}, and a serum sodium level of 122 mEq/L122\text{ mEq/L}. Arterial blood gas results indicate uncompensated respiratory acidosis. Which of the following prescribed interventions should the nurse question?

  1. Applying a forced-air active warming system to rapidly raise core body temperatureAnswer
  2. B
    Administering intravenous hydrocortisone prior to initiating intravenous levothyroxine
  3. C
    Preparing the client for endotracheal intubation and mechanical ventilation
  4. D
    Administering a slow, continuous infusion of 3%3\% hypertonic saline

Answer

The nurse should question the application of a forced-air active warming system, as rapid active rewarming is contraindicated.
The intervention involving a forced-air active warming system must be questioned. In myxedema coma, the cardiovascular system is severely compromised and the client is hypotensive. Active, rapid rewarming forces peripheral vasodilation, which shunts the already limited blood volume away from vital internal organs to the skin. This can precipitate immediate and fatal cardiovascular collapse (shock). Instead, passive rewarming (e.g., using standard warm blankets in a warm room) should be implemented to allow the body temperature to rise gradually as thyroid hormone is replaced.

Step-by-Step Solution

1
Analyze the client's clinical presentation.
The client exhibits signs of myxedema coma including hypothermia, hypotension, severe hyponatremia, and respiratory acidosis.
Establishing the baseline physiological state is necessary to evaluate the safety of prescribed interventions.
2
Evaluate the physiological impact of active rewarming on a compromised cardiovascular system.
Active external rewarming forces peripheral blood vessels to rapidly dilate.
Understanding the physiological response to heat application is critical in shock-like states.
3
Determine the consequence of this vasodilation on the client's current blood pressure.
In a client who is already hypotensive (86/52 mm Hg86/52\text{ mm Hg}), sudden vasodilation will cause a further drop in blood pressure and potentially fatal cardiovascular collapse.
This identifies the intervention as immediately dangerous and requiring clarification with the provider.

Key Concept

In myxedema coma, active external rewarming is contraindicated because it induces rapid peripheral vasodilation, which can precipitate cardiovascular collapse in an already hypotensive client. Passive rewarming is the standard of care.
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Physiological Adaptation

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