During the admission assessment of a client with severe gastroenteritis, the laboratory re… — NCLEX-RN

During the admission assessment of a client with severe gastroenteritis, the laboratory reports a critically low serum potassium level of $2.2\text{ mEq/L}$ . The electronic health record displays a stat prescription for $40\text{ mEq}$ of potassium chloride in $100\text{ mL}$ of $0.9\%$ sodium chloride, to be infused intravenously over $60\text{ minutes}$ . The client is connected to continuous cardiac monitoring and has a 20-gauge peripheral intravenous catheter in the right forearm. Which clinical action should the nurse take next?

Contact the prescribing provider to request a central venous access device or a reduced infusion rate.Answer
B
Initiate the infusion using an electronic volumetric pump and assess the peripheral site for phlebitis every 15 minutes.
C
Administer the medication as a slow intravenous push over 10 minutes to rapidly correct the life-threatening hypokalemia.
D
Verify the chemical compatibility of potassium chloride with the $0.9\%$ sodium chloride diluent before connecting to the Y-site.

Answer

The nurse must contact the prescribing provider to question the prescription because infusing

40\text{ mEq/hr}

of potassium chloride through a peripheral line is unsafe and requires central venous access.

Intravenous potassium chloride is a high-alert vesicant medication. To prevent severe vein irritation, phlebitis, and cardiac arrhythmias, the maximum recommended peripheral infusion rate is

10\text{ mEq/hr}

(up to

20\text{ mEq/hr}

in some facilities with central monitoring, but rarely higher peripherally). Rates of

40\text{ mEq/hr}

require administration through a central venous catheter alongside continuous cardiac monitoring. Because the client only has a 20-gauge peripheral line, the nurse must intervene and question the order to prevent patient harm.

Step-by-Step Solution

Analyze the prescribed medication dose, route, and rate against established safety parameters for the drug.

The prescription is for

40\text{ mEq}

of potassium chloride to infuse over 1 hour (

40\text{ mEq/hr}

) via a peripheral intravenous line.

Intravenous potassium chloride is a high-alert medication with strict administration guidelines to prevent tissue damage and cardiac arrest.

Evaluate the risks associated with the prescribed peripheral infusion rate.

Infusing potassium chloride at

40\text{ mEq/hr}

through a peripheral vein exceeds the maximum safe peripheral rate of

10\text{ mEq/hr}

Potassium chloride is a severe vesicant. High concentrations require larger central vessels with rapid blood flow to ensure immediate hemodilution and prevent chemical phlebitis or necrosis.

Determine the priority nursing intervention based on the identified safety risk.

The nurse must withhold the infusion and advocate for the client by requesting either a central venous catheter or a slower infusion rate.

Nurses have a legal and ethical duty to question and halt unsafe medication orders before administration.

Key Concept

Safe administration parameters and vascular access requirements for high-alert parenteral medications (Potassium Chloride)

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