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Difficulty: Very hardPharmacological and Parenteral Therapies

A registered nurse is preparing to initiate a continuous intravenous (IV) regular human insulin infusion for a client admitted with diabetic ketoacidosis (DKA). Arrange the following nursing actions in the correct sequence.

  1. 1Review the client's most recent serum potassium and blood glucose levels.
  2. 2Prepare the prescribed concentration of regular human insulin in 0.9% sodium chloride.
  3. 3Prime the IV administration set, allowing 20 to 50 mL of the insulin solution to flow through and be discarded.
  4. 4Connect the IV tubing to the injection port closest to the client's venous access site.
  5. 5Begin the continuous infusion via an electronic infusion pump at the prescribed weight-based rate.
  6. 6Evaluate the client's capillary blood glucose level 1 hour after initiation.

Answer

The correct sequence is: Review baseline laboratory values, prepare the insulin mixture, prime the tubing and discard the waste volume to saturate binding sites, connect to the proximal injection port, start the electronic infusion pump, and evaluate the blood glucose level in 1 hour.
The proper sequence for initiating an intravenous insulin infusion heavily prioritizes client safety and advanced pharmacological principles. Assessment (verifying blood glucose and potassium) must occur first to ensure the intervention will not cause harm, such as severe hypokalemia. Next, preparation and specialized priming are required. Priming the tubing with a waste volume is a critical pharmacological step because insulin adsorbs to PVC plastic; saturating the tubing ensures the client receives the actual ordered dose. Finally, connecting the line to a proximal port minimizes dead space, allowing the pump-controlled infusion to act quickly, followed by strict hourly reassessment to guide titration.

Step-by-Step Solution

1
Review the client's most recent serum potassium and blood glucose levels.
The nurse confirms the need for insulin therapy and verifies that the serum potassium is at a safe level to proceed.
Assessment must precede implementation. Insulin causes intracellular shifts of potassium; administering it to a hypokalemic client can induce lethal cardiac dysrhythmias.
2
Prepare the prescribed concentration of regular human insulin in 0.9% sodium chloride.
The intravenous insulin solution is properly mixed and ready for administration.
Once safety parameters are confirmed, the nurse prepares the specific medication. Regular insulin is the standard formulation approved for continuous intravenous use.
3
Prime the IV administration set, allowing 20 to 50 mL of the insulin solution to flow through and be discarded.
The polyvinyl chloride (PVC) binding sites within the inner lumen of the tubing are saturated with insulin.
Insulin strongly adsorbs to standard plastic IV tubing. Discarding this initial volume ensures the fluid that ultimately reaches the client contains the correct, prescribed concentration of insulin rather than a diluted dose.
4
Connect the IV tubing to the injection port closest to the client's venous access site.
The IV tubing is securely attached to the most proximal port on the client's access line.
High-alert continuously titrated medications must be connected as close to the client as possible to minimize dead space and ensure rapid physiological response to rate changes.
5
Begin the continuous infusion via an electronic infusion pump at the prescribed weight-based rate.
The client begins receiving the insulin at a strictly controlled and precise rate.
An electronic infusion pump is mandatory for continuous insulin administration to prevent accidental rapid boluses and ensure accurate metabolic management.
6
Evaluate the client's capillary blood glucose level 1 hour after initiation.
The nurse assesses the client's physiological response to the initial hour of insulin therapy.
Frequent monitoring (typically hourly) is critical to evaluate the therapeutic efficacy of the infusion and to promptly titrate the rate to prevent dangerous hypoglycemia.

Key Concept

Initiating a continuous IV insulin infusion requires a baseline assessment of serum potassium, specialized priming of the IV tubing with 20 to 50 mL of the solution to saturate plastic PVC binding sites, and connection to a proximal port to ensure accurate and safe drug delivery.
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Topics

Pharmacological and Parenteral Therapies

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