Parenteral nutrition: line care, glucose checks, refeeding risk and monitoring

What it is

Parenteral nutrition gives glucose, amino acids, electrolytes, vitamins, minerals and usually lipids into a vein when the gut cannot be used. The solution is concentrated, so it runs through a central line, always by pump. The nurse's checks are about safety: the right bag for the right patient, an aseptic line, scheduled capillary glucose, the fluid balance and weight, the laboratory results and the signs of refeeding syndrome in at-risk patients. Amounts and rates are set by the prescriber and the nutrition team; this page gives none.

Indications

• A gut that cannot be used: paralytic ileus, or after bowel surgery such as a resection.
• Severe malnutrition when enteral feeding is not possible.
• Other situations named by the open sources: severe burns, metastatic cancer, liver failure and severe vomiting in pregnancy.

Contraindications and precautions

• Central venous access only: the concentrated solution irritates smaller veins.
• Many protocols keep one lumen only for parenteral nutrition; the CDC makes no recommendation on this, so follow your protocol.
• Refeeding risk: very low weight, recent weight loss, little or no intake for a long time, low potassium, phosphate or magnesium before feeding, alcohol or drug use, cancer, frailty, anorexia nervosa.
• In at-risk patients the team starts slowly, gives thiamine before or at the start of feeding and replaces electrolytes as prescribed.
• Check every bag against the prescription and the label, and inspect it as the protocol says before hanging it.

Equipment

• The prescribed bag, checked against the prescription and the patient's identity.
• Infusion pump and the administration set the protocol specifies.
• Antiseptic for the connector and sterile caps or devices.
• Glucose meter and strips.
• Scale and fluid balance chart.

Step by step (and why)

1. Do hand hygiene and use aseptic technique before every access — the line is a direct path for infection.
2. Check the bag against the prescription, identity, expiry and appearance with a second nurse if required — errors and damaged bags harm.
3. Scrub the connector with antiseptic and access it only with sterile devices — it lowers line infection.
4. Prime the set without air and run it by pump only — a pump keeps the prescribed rate.
5. Change lipid-containing sets within 24 hours and label them; other sets as the protocol says — lipids support bacterial growth.
6. Check capillary glucose on the protocol's schedule and report values outside the targets — high glucose is common.
7. If the infusion stops unplanned, check glucose and tell the team — sudden stops cause hypoglycaemia.
8. Weigh daily if ordered, keep a fluid balance and take vital signs — refeeding and overload show here first.
9. Follow the ordered tests (phosphate, potassium, magnesium, sodium, glucose, kidney) in the first week and report falls.
10. Inspect the site and dressing each shift and check temperature — catch line infection early.

Complications

• Central line infection: fever, chills, redness or discharge at the site (see central line care).
• High blood glucose, common during parenteral nutrition and linked to infection and death.
• Low blood glucose, mostly after unplanned interruptions.
• Refeeding syndrome: fast heart rate and breathing, arrhythmias, heart failure, oedema, weakness, confusion, seizures, and Wernicke encephalopathy from low thiamine.
• Fluid overload, and nutrient excess shown by the laboratory tests.

Next step: when to call for help

• Call for fever, chills or changes at the line site.
• Call for glucose values outside the protocol's targets, and for any unplanned stop of the infusion.
• Call in the first days for new oedema, breathlessness, a fast or irregular pulse, weakness or confusion: possible refeeding syndrome.
• Report falls in phosphate, potassium or magnesium as soon as the results arrive.
• Report a blocked line, a damaged or wrong bag, or a pump problem.

Test yourself

Think of the answer, then tap the question to see it.

Add to my cards (4)

Connections

← All of nursing

Educational content for students; it does not replace your institution's protocols, supervised clinical training or a prescriber's order. Dose-calculation examples use made-up numbers: they are educational, not a clinical order.

Sources: Nursing Fundamentals, 14.3 Nutrition: Applying the Nursing Process (Open RN (Chippewa Valley Technical College), LibreTexts, 2021); Guidelines for the Prevention of Intravascular Catheter-Related Infections (2011): Summary of Recommendations (Centers for Disease Control and Prevention, 2011); The refeeding syndrome: a neglected but potentially serious condition for inpatients. A narrative review (Internal and Emergency Medicine (open access, CC BY 4.0, PMC), 2021); Differences in glycemic control in diabetic and non-diabetic patients with parenteral nutrition using a basal plus correction insulin regimen (Diabetes Therapy (open access, CC BY-NC 4.0, PMC), 2018).

Spotted a mistake?We are always improving for the community. Tell us what is wrong and our team will review it.Report a mistake

Send

Representative model, for educational purposes only.