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Difficulty: MediumPharmacological and Parenteral Therapies

An emergency department nurse is preparing to manage a newly admitted client experiencing diabetic ketoacidosis. The treatment plan includes initiating a continuous intravenous infusion of regular insulin. Which of the following interventions should the nurse include in the client's plan of care? Select all that apply.

  1. Flush the intravenous tubing with 50 mL of the prepared regular insulin solution prior to attaching it to the clientAnswer
  2. B
    Initiate the regular insulin continuous infusion immediately, prior to obtaining the baseline serum potassium level
  3. Add 5% dextrose to the intravenous hydration fluids when the client's blood glucose level drops to 250 mg/dL (13.9 mmol/L)Answer
  4. D
    Administer intermittent intravenous push (IVP) antibiotics directly into the same intravenous line as the insulin infusion without verifying compatibility
  5. Assess the client's capillary blood glucose levels every hour while the continuous insulin infusion is activeAnswer
  6. F
    Calculate the initial insulin bolus dose using the client's estimated dry weight documented from a previous hospital admission

Answer

The correct actions include flushing the intravenous tubing with the insulin solution prior to connection, adding 5% dextrose to fluids when blood glucose reaches 250 mg/dL (13.9 mmol/L), and monitoring capillary blood glucose levels every hour.
Intravenous regular insulin adheres to the inner lining of standard polyvinyl chloride (PVC) tubing. Flushing the tubing with 20 to 50 mL of the insulin solution saturates these binding sites, guaranteeing that the client receives the prescribed concentration. As blood glucose levels decline during treatment and approach 250 mg/dL (13.9 mmol/L), the nurse must add a dextrose source (such as 5% dextrose) to the intravenous fluids. This step prevents a rapid drop in serum osmolality and avoids hypoglycemia, which can trigger cerebral edema. Furthermore, continuous insulin infusions mandate strict monitoring; hourly capillary blood glucose checks are required to safely titrate the infusion based on established protocols.

Step-by-Step Solution

1
Identify the primary physiological and pharmacological risks associated with continuous regular insulin infusions for diabetic ketoacidosis.
The main risks include rapidly developing hypoglycemia, hypokalemia, and dosing errors due to drug adherence to tubing or incorrect weight estimates.
Understanding the pharmacodynamics of intravenous insulin is essential for safe administration and anticipating complications.
2
Evaluate the options related to preparation and safe administration.
Flushing the tubing saturates binding sites, ensuring accurate dosing. Using the current actual weight is required for high-alert medication dosing, invalidating the use of old or estimated weights. IV compatibility must always be checked.
Insulin adsorbs to PVC tubing, which can result in under-dosing if not properly primed. Incompatible medications can precipitate or alter drug efficacy.
3
Evaluate the options related to monitoring and concurrent fluid therapies.
Hourly blood glucose checks are the standard of care. Adding dextrose when glucose reaches 250 mg/dL (13.9 mmol/L) prevents hypoglycemia. Checking the baseline potassium before starting insulin is mandatory.
Frequent monitoring and proactive fluid adjustments stabilize the client's metabolic state without causing dangerous shifts in glucose or electrolytes.

Key Concept

Safe administration and continuous monitoring of intravenous regular insulin therapy.
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Topics

Pharmacological and Parenteral Therapies

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