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Difficulty: HardPhysiological Adaptation

A young adult client is admitted to the intensive care unit with profound lethargy, deep and rapid respirations, and a capillary blood glucose of 680 mg/dL (37.7 mmol/L). The healthcare provider diagnoses severe diabetic ketoacidosis (DKA). Arrange the following nursing interventions in the correct physiological priority order for managing this acute crisis. (Place the most immediate priority action at the top and the final transition action at the bottom).

  1. 1Establish peripheral vascular access and infuse 0.9% sodium chloride rapidly.
  2. 2Evaluate the initial comprehensive metabolic panel to verify the serum potassium level.
  3. 3Initiate a continuous intravenous infusion of regular insulin.
  4. 4Append 5% dextrose to the maintenance intravenous fluids when blood glucose falls to 250 mg/dL (13.9 mmol/L).
  5. 5Administer a prescribed basal dose of subcutaneous insulin prior to discontinuing the intravenous insulin infusion.

Answer

The correct sequence is: 1) Infuse 0.9% sodium chloride rapidly, 2) Verify the serum potassium level, 3) Initiate a continuous IV regular insulin infusion, 4) Add 5% dextrose when glucose falls to 250 mg/dL, and 5) Administer subcutaneous insulin before stopping the IV infusion.
The physiological management of DKA follows a strict sequential protocol based on life-threatening priorities. The immediate threat is hypovolemic shock from profound osmotic diuresis, necessitating rapid isotonic fluid resuscitation to restore perfusion. Once volume is restoring, the nurse must ensure the serum potassium is safe (>3.3 mEq/L) because insulin therapy will aggressively drive extracellular potassium into the cells. After potassium is verified, a continuous regular insulin infusion is started to reverse ketogenesis and correct the metabolic acidosis. As the blood glucose approaches 250 mg/dL (13.9 mmol/L), dextrose is introduced into the IV fluids to prevent sudden hypoglycemia and protect against cerebral edema from rapid osmolality shifts. Finally, when the acidosis is resolved and the IV insulin is ready to be discontinued, a subcutaneous basal dose must be administered with a 1 to 2 hour overlap to prevent rebound diabetic ketoacidosis.

Step-by-Step Solution

1
Address the most immediate threat to circulation.
Isotonic fluid resuscitation is initiated.
Profound dehydration from osmotic diuresis compromises tissue perfusion. Intravascular volume must be restored before medications can effectively circulate.
2
Ensure physiological safety prior to pharmacological intervention.
Serum potassium is evaluated.
Insulin therapy causes an intracellular shift of potassium. If the client is hypokalemic, insulin can cause lethal cardiac arrhythmias.
3
Revert the underlying pathophysiological metabolic crisis.
Continuous intravenous regular insulin is started.
Insulin is required to suppress fat breakdown and ketogenesis, which directly reverses the severe metabolic acidosis.
4
Anticipate and prevent iatrogenic complications as treatment progresses.
Dextrose is added to the IV fluids when blood glucose reaches 250 mg/dL (13.9 mmol/L).
A rapid drop in serum osmolality can cause fluid shifts into the brain, resulting in cerebral edema. Dextrose stabilizes the glucose decline.
5
Safely transition the client from acute emergency management to maintenance therapy.
Subcutaneous insulin is given before the IV infusion is stopped.
Intravenous insulin has a very short half-life. An overlap with subcutaneous insulin is necessary to prevent immediate recurrence of ketogenesis.

Key Concept

The physiological management of Diabetic Ketoacidosis (DKA) requires a strict priority sequence: volume resuscitation, electrolyte safety verification, insulin administration, complication prevention, and safe transition.
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Topics

Physiological Adaptation

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