Parenteral Nutrition (PN) and Total Parenteral Nutrition (TPN) are intravenous (IV) feeding methods used when a patient is unable to ingest food orally, or through a gastric feeding tube. The patient receives nutritional formulas containing salts, glucose, amino acids, lipids and added vitamins intravenously. The principle forms of parenteral nutrition are peripheral (PN) and central (TPN).
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