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Difficulty: HardPharmacological and Parenteral Therapies

The nurse is reviewing new medication prescriptions for a client admitted with severe hypokalemia. The healthcare provider has ordered 40 mEq of intravenous potassium chloride (KCl) mixed in 100 mL of 0.9% sodium chloride to be infused immediately. The client currently has a single 22-gauge peripheral intravenous catheter in the left hand. Which action by the nurse represents the safest pharmacological practice?

  1. Withhold the medication and contact the provider to request diluting the potassium dose in a larger volume of intravenous fluid.Answer
  2. B
    Administer the solution through the existing peripheral catheter using an infusion pump programmed to deliver the dose over 4 hours.
  3. C
    Y-site the potassium chloride solution into a continuous intravenous heparin infusion to minimize the need for additional venipuncture.
  4. D
    Initiate the peripheral infusion and instruct the unlicensed assistive personnel to monitor the insertion site for swelling every 15 minutes.

Answer

The correct action is to withhold the medication and contact the provider to request diluting the potassium dose in a larger volume of intravenous fluid.
Intravenous potassium chloride is a high-alert medication and a known vesicant. For peripheral administration, the maximum safe concentration is typically 40 mEq/L (or 10 mEq per 100 mL). The ordered concentration of 40 mEq in 100 mL is extremely hyperosmolar and will cause severe phlebitis, burning, and potential tissue necrosis in a small peripheral vein. The nurse must withhold the dose and request that it be diluted in a larger volume of fluid (such as 1,000 mL) or request an order for a central venous catheter.

Step-by-Step Solution

1
Analyze the prescribed medication dosage and its concentration.
The order is for 40 mEq of KCl in 100 mL of normal saline, which equates to a concentration of 400 mEq/L.
Calculating the concentration is required to determine if the fluid is safe for the current venous access.
2
Evaluate the client's current venous access against established safety parameters for potassium administration.
The client has a 22-gauge peripheral catheter. The maximum safe peripheral concentration for KCl is typically 40 mEq/L (or 10 mEq per 100 mL).
Highly concentrated potassium is a severe vesicant that damages small peripheral veins.
3
Identify the clinical risk of the current order.
Administering 40 mEq in only 100 mL through a peripheral line poses an imminent risk for severe chemical phlebitis, extreme pain, and tissue necrosis.
Safety standards dictate that highly concentrated KCl must be administered via a central venous catheter.
4
Formulate the priority nursing intervention.
The nurse must hold the unsafe order and advocate for the client by requesting appropriate dilution (e.g., 40 mEq in 1,000 mL) or placement of a central line.
Nurses are legally and ethically responsible for preventing patient harm from unsafe medical orders.

Key Concept

Safe administration of intravenous potassium chloride requires strict adherence to both maximum infusion rates (10 mEq/hr peripherally) and maximum concentrations (40 mEq/L peripherally) to prevent fatal dysrhythmias and severe venous injury.
Estimated Time:1m 30s
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Topics

Pharmacological and Parenteral Therapies

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