# Review the metabolic trend after parenteral nutrition begins and determine the safest response.

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> language: en  
> subject: Total Parenteral Nutrition  
> category: PPT

## Question

Review the metabolic trend after parenteral nutrition begins and determine the safest response.

| Time | Data |
| --- | --- |
| Before nutrition | BMI 16 kg/m²; negligible intake for 10 days; phosphorus 3.2 mg/dL, potassium 3.6 mmol/L, magnesium 1.8 mg/dL; HR 84/min. |
| 24 hours after PN begins | Phosphorus 2.0 mg/dL, potassium 3.1 mmol/L, magnesium 1.5 mg/dL; glucose 218 mg/dL; new ankle edema. |
| 48 hours after PN begins | Phosphorus 1.1 mg/dL, potassium 2.8 mmol/L, magnesium 1.2 mg/dL; HR 122/min; increasing weakness and shallow respirations. |

Q1. How should the nurse interpret the trend?

Expected nutritional recovery
Evolving refeeding syndrome
Isolated fluid overload unrelated to nutrition
Resolution of malnutrition

Q2. What is the priority response?

Increase the calorie delivery to replace the weight faster
Continue the same infusion and recheck in one week
Notify the team, reduce or pause calorie advancement, give thiamine, and replace electrolytes per protocol
Treat the edema with fluid restriction alone

Q3. Which monitoring plan is most important during stabilization?

Daily weight alone
Serum sodium once at discharge
Weekly glucose without cardiac assessment
Frequent phosphorus, potassium, magnesium, glucose, fluid balance, respiratory, and cardiac assessment

## Explanation

The rapid decline in phosphorus, potassium, and magnesium after calories are introduced, accompanied by edema, weakness, tachycardia, and rising glucose, indicates refeeding syndrome. Insulin-driven intracellular shifts can cause cardiac, respiratory, and neurologic failure. The nurse should notify the nutrition and medical teams, reduce or pause calorie advancement according to the treatment plan, give thiamine, replace electrolytes, and increase clinical and laboratory monitoring. Simply adding more calories or waiting for symptoms to resolve can accelerate deterioration.

## In-depth explanation

Correct Answer
The trend is most consistent with evolving refeeding syndrome.

Why It Fits
A severely malnourished client develops major phosphate, potassium, and magnesium declines soon after parenteral calories begin.

Clinical Picture
Carbohydrate-driven insulin release shifts electrolytes into cells and promotes sodium and fluid retention, threatening cardiac and respiratory function.

Memory Link
After starvation, feed slowly and watch phosphorus first.

NCLEX Rule
Identify high risk before feeding, provide thiamine, advance calories cautiously, and monitor and replace phosphorus, potassium, and magnesium.

Why the Alternatives Fail
Increasing calories, treating edema with fluid restriction alone, or ignoring low electrolytes does not correct the metabolic shift.

Sources
1ASPEN Consensus Recommendations for Refeeding Syndrome
2NCSBN 2026 NCLEX-RN Test Plan

## Clinical scenario

Nutrition support service
An adult with negligible intake for 10 days and marked weight loss begins parenteral nutrition. Baseline electrolytes were corrected into the low-normal range, and thiamine was not given before the infusion.

## Key concepts

- **Refeeding syndrome** — Potentially dangerous fluid and electrolyte shifts after nutrition is reintroduced to a severely undernourished person.
- **Hypophosphatemia** — A low serum phosphorus level that can impair energy production, muscle function, breathing, and cardiac performance.
- **Thiamine** — Vitamin B1, an essential cofactor in carbohydrate metabolism that should be supplied in clients at high refeeding risk.

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_For study reference only. Always follow current clinical guidelines and your institution’s protocols._