Contraindications and Precautions for Total Parenteral Nutrition (TPN)

Metabolic Abnormalities Requiring Correction Before TPN

TPN should be delayed until glucose control is achieved with insulin therapy and blood glucose is maintained closer to normal range 1
Severe hypokalemia, hypomagnesemia, or hypophosphatemia must be corrected before initiating TPN to prevent refeeding syndrome 2, 3
Phosphate, potassium, and magnesium levels should be normalized before starting TPN, especially in malnourished patients 2, 4
Electrolyte abnormalities are common in patients with kidney failure receiving kidney replacement therapy and require close monitoring before and during TPN 2

In patients with alcoholic liver disease, vitamin B1 (thiamine) must be administered prior to starting glucose infusion to reduce the risk of Wernicke's encephalopathy 3, 4
In patients with liver failure, ammonia levels should be monitored and amino acid provision adjusted accordingly 4
Patients with cirrhosis and severe hepatic encephalopathy should have specialized amino acid solutions (rich in branched-chain amino acids and low in aromatic amino acids) 4
In critically ill patients with acute kidney injury or chronic kidney disease with kidney failure, high-dose parenteral glutamine should not be administered 2
Electrolyte abnormalities are common in patients receiving kidney replacement therapy and require close monitoring before starting TPN 2

Regular blood glucose monitoring is essential to avoid TPN-related hyperglycemia 4
Electrolyte monitoring (especially phosphate, potassium, magnesium) is critical when refeeding malnourished patients 2, 4
Triglyceride levels should be monitored to maintain values below 12 mmol/L 1

Overfeeding is detrimental to cardiopulmonary and hepatic function and should be avoided by starting with a low-calorie regimen 7