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Difficulty: Very hardReduction of Risk Potential

A critical care nurse is managing a client diagnosed with severe diabetic ketoacidosis. The client is currently receiving intravenous 0.9%0.9\% sodium chloride and a continuous regular insulin infusion. Clinical assessment reveals lethargy and a regular, deep respiratory rate of 3232 breaths per minute. The most recent laboratory results indicate:

• Arterial blood gas: pH 7.267.26, PaCO 2_2 2929 mmHg, HCO 3−_3^- 1212 mEq/L, PaO 2_2 9494 mmHg
• Serum glucose: 242242 mg/dL (13.413.4 mmol/L)
• Serum potassium: 3.13.1 mEq/L (3.13.1 mmol/L)

Which intervention should the nurse perform first to mitigate the risk of a fatal physiological complication?

  1. Suspend the continuous regular insulin infusion immediatelyAnswer
  2. B
    Transition the primary intravenous fluid to include 5%5\% dextrose
  3. C
    Administer a prescribed intravenous sodium bicarbonate bolus
  4. D
    Coach the client to take shallow breaths to reduce carbon dioxide loss

Answer

Suspend the continuous regular insulin infusion immediately.
In diabetic ketoacidosis (DKA), total body potassium is severely depleted despite potentially normal initial serum levels. Insulin therapy shifts potassium from the extracellular space into the intracellular space, which can rapidly precipitate severe, life-threatening hypokalemia. Evidence-based protocols mandate that if the serum potassium falls below 3.33.3 mEq/L, the insulin infusion must be suspended immediately, and aggressive potassium replacement must be initiated to prevent fatal cardiac arrhythmias. Addressing this immediate threat to life constitutes the highest priority in risk reduction.

Step-by-Step Solution

1
Analyze the client's current potassium level.
The serum potassium is 3.13.1 mEq/L, which is critically low (below the 3.33.3 mEq/L threshold).
Identifying life-threatening electrolyte imbalances is the primary step in physiological risk reduction.
2
Evaluate the physiological effect of the current medical interventions.
The continuous insulin infusion is actively shifting the already depleted potassium from the extracellular space into the intracellular space.
Understanding pharmacodynamics is required to anticipate iatrogenic complications during treatment.
3
Determine the priority intervention based on risk reduction protocols.
The insulin infusion must be stopped immediately until the potassium level is corrected.
Continuing insulin will worsen the hypokalemia, inevitably leading to fatal cardiac dysrhythmias. This preventative action takes strict priority over resolving the hyperglycemia.

Key Concept

In the management of diabetic ketoacidosis, insulin therapy must be immediately withheld if the serum potassium drops below 3.33.3 mEq/L to prevent fatal hypokalemia-induced cardiac arrhythmias.
Estimated Time:2m 0s
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Reduction of Risk Potential

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