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Difficulty: MediumPharmacological and Parenteral Therapies

A nurse is caring for a client who is receiving a continuous infusion of total parenteral nutrition (TPN) through a single-lumen peripherally inserted central catheter (PICC). The client reports severe nausea, and the healthcare provider prescribes ondansetron 4 mg IV push once immediately. Which of the following is the priority nursing action?

  1. A
    Administer the ondansetron through the lowest Y-site port on the total parenteral nutrition administration tubing.
  2. B
    Pause the total parenteral nutrition, flush the catheter with normal saline, administer the ondansetron, and restart the infusion.
  3. Establish a new peripheral intravenous catheter and administer the ondansetron through the new access site.Answer
  4. D
    Withhold the ondansetron until the total parenteral nutrition infusion is complete to avoid intravenous incompatibilities.

Answer

The correct action is to establish a new peripheral intravenous catheter and administer the ondansetron through the new access site.
Total parenteral nutrition (TPN) is a complex hypertonic solution containing dextrose, amino acids, trace elements, and electrolytes. It carries a high risk of chemical incompatibility and infection. Evidence-based practice strictly dictates that TPN must be infused through a dedicated central intravenous line. Because the client has a single-lumen catheter currently in use, the nurse cannot safely interrupt the infusion or inject medications into that line via a Y-site. Therefore, starting a new peripheral intravenous catheter is the only safe and appropriate action to provide timely relief for the client's severe nausea without compromising the safety of the TPN therapy.

Step-by-Step Solution

1
Analyze the client's current intravenous access and ongoing therapy.
The client has a single-lumen PICC line currently being used for a continuous TPN infusion.
Understanding the existing vascular access dictates how safely new medications can be administered.
2
Recall evidence-based guidelines for total parenteral nutrition (TPN) administration.
TPN requires a strictly dedicated intravenous line due to its high osmolarity, complex chemical makeup, and high risk for bacterial growth.
Mixing medications with TPN or interrupting its flow can cause dangerous chemical precipitates, systemic infection, or rebound hypoglycemia.
3
Evaluate the options based on TPN safety guidelines and the client's acute need for symptom relief.
Using the existing TPN line via Y-site or by pausing the infusion is contraindicated. Delaying the medication is inappropriate given the acute nausea.
The only safe and effective way to deliver the prescribed IV push medication is to gain separate venous access.
4
Select the safest nursing intervention.
The nurse must insert a new peripheral IV catheter to administer the ondansetron.
This action provides timely symptom relief while maintaining the integrity and safety of the continuous TPN infusion.

Key Concept

Total Parenteral Nutrition (TPN) Administration Safety and Dedicated IV Lines
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Topics

Pharmacological and Parenteral Therapies

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