Parenteral Nutrition in Cachectic Lung Cancer Patients

Indications and Contraindications

The American Society for Parenteral and Enteral Nutrition recommends parenteral nutrition (PN) in cachectic lung cancer patients only when oral or enteral nutrition is not feasible and the patient has inadequate intake (<60% of energy needs) anticipated for more than 10 days, or when specific gastrointestinal complications prevent enteral feeding 1, 2
PN should never be used if oral or enteral nutrition is adequate or feasible, as stated by the European Society for Clinical Nutrition and Metabolism 2, 3
The presence of cachexia alone does not justify PN—there must be intestinal failure or inability to use the enteral route, according to the American Gastroenterological Association 1, 4

Severe mucositis or radiation enteritis preventing enteral intake is an indication for PN, as recommended by the Multinational Association of Supportive Care in Cancer 2, 3
Acute gastrointestinal complications from chemotherapy or radiotherapy that preclude enteral feeding are an indication for PN, according to the European Society for Medical Oncology 1, 4
Anticipated inadequate intake (<60% of energy expenditure) for >10 days when enteral route is not possible is an indication for PN, as stated by the American Society for Parenteral and Enteral Nutrition 2, 3

Energy requirements for bedridden patients should be 20-25 kcal/kg/day, and for ambulatory patients 25-30 kcal/kg/day, as recommended by the European Society for Clinical Nutrition and Metabolism 1, 4, 6
A higher fat-to-glucose ratio (50% of non-protein energy as lipid) should be used in cachectic patients requiring prolonged PN, according to the American Society for Parenteral and Enteral Nutrition 1, 4, 5

Cachectic patients with >20% weight loss over 3 months are at high risk for refeeding syndrome, as warned by the National Institute for Health and Care Excellence 7
Prevention protocol includes starting PN at no more than 25% of calculated energy requirements and prophylactically supplementing phosphate before and during initial PN, as recommended by the American Society for Parenteral and Enteral Nutrition 7

Although specific monitoring protocols are not fully cited, general principles of monitoring during PN include assessing nutritional status, functional status, prognosis, and catheter-related complications, which are critical for patient care 1, 3