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Difficulty: Very hardReduction of Risk Potential

A nurse is evaluating a 42-year-old client 24 hours after a total thyroidectomy. The client appears highly anxious and reports new-onset numbness around the lips and fingertips.

Current vital signs:
- Blood pressure: 138/86 mm Hg
- Heart rate: 112 beats/min
- Respiratory rate: 28 breaths/min
- SpO2: 96% on room air

Current laboratory results:
- Total serum calcium: 7.4 mg/dL (1.85 mmol/L)
- Arterial blood gas (ABG): pH 7.51, PaCO2 29 mm Hg, HCO3 23 mEq/L, PaO2 94 mm Hg

To most rapidly mitigate the client's risk for an impending life-threatening complication, which action should the nurse implement first?

  1. Coach the client to systematically slow their respiratory rate and breathe into a paper bag.Answer
  2. B
    Administer the prescribed intravenous calcium gluconate by rapid intravenous push.
  3. C
    Prepare to administer a continuous intravenous infusion of sodium bicarbonate.
  4. D
    Assist the client into a flat, supine position to promote venous return.

Answer

The most immediate action is to coach the client to systematically slow their respiratory rate and breathe into a paper bag.
The client is experiencing hypocalcemia secondary to a total thyroidectomy, which is currently being severely exacerbated by respiratory alkalosis from hyperventilation. In an alkalotic state, hydrogen ions detach from serum albumin, freeing up negatively charged binding sites that immediately bind ionized calcium. This acute drop in free, active calcium levels precipitates life-threatening tetany and laryngospasm. By coaching the client to slow their breathing and re-breathe carbon dioxide, the nurse effectively corrects the respiratory alkalosis. As the pH normalizes, calcium is released from the albumin, rapidly increasing the ionized calcium levels and mitigating the immediate physiological risk of airway compromise.

Step-by-Step Solution

1
Analyze the client's postoperative risk and clinical manifestations.
The client is 24 hours post-thyroidectomy and exhibiting circumoral numbness and anxiety, which are classic early signs of hypocalcemia resulting from inadvertent parathyroid gland removal or damage.
Identifying the underlying complication is the critical first step in clinical judgment.
2
Interpret the arterial blood gas (ABG) and laboratory results.
The ABG reveals uncompensated respiratory alkalosis (pH 7.51, PaCO2 29 mm Hg). The total serum calcium is critically low at 7.4 mg/dL.
The client's tachypnea (respiratory rate of 28) is blowing off excessive CO2, causing the alkalotic state.
3
Link the acid-base imbalance to the electrolyte disturbance.
In an alkalotic state, hydrogen ions dissociate from serum albumin, freeing up negatively charged binding sites. Ionized (active) calcium rapidly binds to these newly available sites, drastically lowering the free ionized calcium level in the blood.
This acute drop in ionized calcium heavily exacerbates the symptoms of hypocalcemia, placing the client at immediate risk for life-threatening tetany or laryngospasm.
4
Select the most appropriate, immediate intervention to mitigate the risk.
Coaching the client to slow their breathing or breathe into a paper bag retains CO2, thereby lowering the blood pH. This reverses the alkalosis, causes calcium to detach from albumin, and rapidly increases active ionized calcium levels.
This physiological temporizing measure quickly mitigates the imminent threat of airway compromise while the nurse prepares for safe, slow intravenous calcium replacement.

Key Concept

Acid-Base Effects on Calcium Ionization
Estimated Time:2m 0s
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Topics

Reduction of Risk Potential

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