A patient on day 2 of total parenteral nutrition (TPN) has a capillary glucose of 248 mg/dL. The TPN bag has 8 hours remaining. Which is the most appropriate nursing action?
1Temporarily discontinue the TPN infusion, notify the provider, and run 0.9% sodium chloride at a keep-vein-open rate until the blood glucose returns to the target range, then resume the TPN and continue to monitor blood glucose.
2Discontinue the TPN infusion immediately, notify the provider, and initiate a continuous insulin infusion while maintaining intravenous access with normal saline to safely manage the elevated glucose level.
3Accelerate the TPN infusion to complete the remainder of the bag within 4 hours, then hang a new bag containing insulin as prescribed to address the hyperglycemia more promptly, and continue monitoring blood glucose.
4Continue the TPN at the current rate, notify the provider, and anticipate added regular insulin in the next bag (or sliding-scale subcutaneous insulin per protocol) with continued capillary glucose monitoring every 4 to 6 hours.✓ Correct answer
Explanation
Hyperglycemia on TPN is managed by continuing the TPN at the current rate (abrupt discontinuation causes REBOUND HYPOGLYCEMIA) and adding regular insulin to the next bag or using sliding-scale subcutaneous insulin per protocol, while monitoring capillary glucose every 4-6 hours. Choice 2 is dangerous — abruptly stopping TPN causes hypoglycemia because the patient's endogenous insulin response is calibrated to the dextrose load. Choice 3 worsens hyperglycemia. Choice 1 is unnecessary and removes nutrition delivery.
The TPN hypoglycemia rebound is the most-tested mechanism: stopping TPN abruptly causes a 30-60 minute lag of high endogenous insulin meeting NO dextrose, leading to hypoglycemia. If TPN must be stopped, taper down OR hang D10W to bridge.
Day 2 of TPN through a central venous catheter. Capillary glucose 248 mg/dL. The TPN bag has 8 hours remaining. Vital signs stable; patient denies polyuria.
TPN-induced hyperglycemia — Common in early TPN due to high dextrose load; managed with continued infusion + added insulin, not discontinuation.
TPN rebound hypoglycemia — Hypoglycemia after abrupt TPN stop because endogenous insulin lags; prevent by tapering or D10W bridge.
Capillary glucose monitoring on TPN — Every 4-6 hours initially; adjust frequency as glycemic stability improves.