Intravenous (IV) nutrition, also known as parenteral nutrition (PN), is a treatment that delivers nutrients to people who cannot receive food orally or through a feeding tube. This treatment can be used for patients of all ages and for a wide variety of medical issues.
Below, we’ll take a look at how parenteral nutrition works, when it’s used, how it prevents malnutrition, and the potential risks involved.
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What is IV for nutrition?
Parenteral nutrition involves inserting an IV catheter into a vein to deliver nutrients directly into the bloodstream, bypassing the body’s normal digestion process. Patients with illnesses or injuries that compromise any part of the gastrointestinal (GI) tract require this alternate method to prevent malnutrition.
There are two types:
- Total Parenteral Nutrition (TPN):
Delivered through a catheter placed in the superior vena cava, a large vein leading directly to the heart.
- Peripheral Parenteral Nutrition (PPN):
Used for temporary nutritional assistance; delivered through a catheter in a peripheral vein, commonly the basilic vein in the elbow.
In both cases, the catheter is hooked up to a bag containing the specific nutrients needed.
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What is inside a parenteral nutrition IV?
Solutions are customized based on the patient's age, weight, medical condition, and health factors. All bags include sterile liquid (water or saline) for hydration
, alongside key nutrients:
- Carbohydrates (dextrose):
Provides calories for energy.
- Protein (amino acids):
Supports cell function, fighting infection, and tissue repair.
- Fats (lipids):
Provides energy, protects organs, and stores vitamins.
- Vitamins:
Including A, B, C
, D, E, and K.
- Minerals:
Including zinc, iron, copper, chromium, manganese, and selenium.
- Electrolytes:
Such as calcium
, magnesium
, potassium, phosphorus, and sodium to maintain bone, nerve, and organ function.
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Why do people need parenteral nutrition?
Patients are typically at risk for malnutrition due to conditions such as:
- Cancer:
Tumors or treatments can cause appetite loss, nausea, or malabsorption.
- Crohn's disease:
Impacts digestion and nutrient absorption, often causing severe dehydration
and inflammation.
- Short bowel syndrome (SBS):
Occurs when there is not enough small intestine to absorb nutrients, often due to birth defects or surgery.
- Ischemic bowel disease:
Caused by decreased blood flow to the small intestine.
- Digestive tract dysfunctions:
Conditions like irritable bowel syndrome or diverticulitis that can cause chronic bleeding, vomiting, or diarrhea.
- Intestinal blockage:
In advanced abdominal cancers where surgery is not an option.
- Birth defects & chronic diarrhea in children:
Used to prevent growth issues until the digestive system can function or be repaired.
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Risks involved in IV nutrition
Because the body is designed to receive nutrition through the GI tract, bypassing it can lead to complications, including:
- Painful vein irritation and inflammation
- Blood clots and embolisms (which can result in stroke)
- Overhydration or fluid build-up in the lungs
- Mineral and fluid imbalances
- Blood sugar issues (e.g., hypoglycemia)
- Liver and bone disease
Catheter infection
is a common and serious complication; it is crucial to keep tubing, ports, and all equipment strictly clean and sterile.
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