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Difficulty: MediumPharmacological and Parenteral Therapies

An adult individual recovering from a severe gastrointestinal resection is receiving total parenteral nutrition (TPN) via a peripherally inserted central catheter (PICC). The nurse observes that the current bag of TPN has less than 20 mL20\text{ mL} remaining. The hospital pharmacy informs the unit that the next prepared nutritional solution will be delayed by approximately two hours. Based on the client's current therapy, which of the following is the most appropriate nursing action to take next?

  1. A
    Decrease the infusion pump rate of the current bag by half to ensure the remaining fluid lasts until the new supply arrives.
  2. B
    Flush the central venous catheter with 0.9%0.9\% sodium chloride and cap the port to maintain line patency during the delay.
  3. Initiate an infusion of 10%10\% dextrose in water at the exact same flow rate as the current total parenteral nutrition.Answer
  4. D
    Hang a continuous infusion of 0.9%0.9\% sodium chloride at the prescribed rate to maintain vascular volume.

Answer

The most appropriate nursing action is to initiate an infusion of 10%10\% dextrose in water at the exact same flow rate as the current total parenteral nutrition.
Total parenteral nutrition (TPN) contains a high concentration of glucose, which causes the pancreas to release a steady, elevated amount of insulin. If the TPN infusion is abruptly stopped or significantly delayed, the high levels of circulating insulin will rapidly lower the client's blood glucose, leading to severe rebound hypoglycemia. To prevent this dangerous complication, standard nursing protocol dictates immediately hanging an intravenous solution with a similar glucose concentration, typically 10%10\% dextrose in water (D10W), and infusing it at the exact same flow rate until the next bag of TPN is available.

Step-by-Step Solution

1
Identify the primary physiological risk associated with an abrupt cessation of total parenteral nutrition (TPN).
The high glucose content in TPN stimulates a steady, elevated release of endogenous insulin. Stopping the infusion suddenly creates a high risk for profound rebound hypoglycemia.
Anticipating complications based on pharmacokinetics and physiology is a critical component of safe parenteral therapy management.
2
Determine the necessary nursing intervention to prevent this specific complication during a delay.
The client requires a substitute intravenous fluid that provides a comparable concentration of glucose to match the circulating insulin levels.
Maintaining a steady supply of glucose prevents the blood sugar from dropping precipitously while the body gradually adjusts its insulin output.
3
Select the most appropriate intravenous solution from standard protocols.
10%10\% dextrose in water (D10W) administered at the same rate as the TPN is the standard emergency substitute.
D10W contains a sufficient glucose concentration to mimic many standard TPN formulations and is readily accessible in emergency or delay situations.

Key Concept

Prevention of rebound hypoglycemia during abrupt cessation of total parenteral nutrition.
Estimated Time:1m 0s
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Topics

Pharmacological and Parenteral Therapies

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