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Lipid Infusion – Definition, Uses and Effects

A lipid infusion is an intravenous administration of fat emulsions used for nutritional support or medical treatment. It is primarily used in parenteral nutrition and lipid rescue therapy.

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Things worth knowing about "Lipid Infusion"

A lipid infusion is an intravenous administration of fat emulsions used for nutritional support or medical treatment. It is primarily used in parenteral nutrition and lipid rescue therapy.

What Is a Lipid Infusion?

A lipid infusion (also called a lipid emulsion or fat infusion) is an intravenous solution containing fats in the form of fine emulsions. It is administered directly into the bloodstream and serves either as an energy source within parenteral nutrition or as an antidote in cases of poisoning by lipid-soluble substances.

Composition and Types

Lipid infusions typically consist of vegetable oils (e.g., soybean oil, olive oil, fish oil), an emulsifier such as egg lecithin, and glycerol. Based on their fatty acid composition, lipid emulsions are classified into several generations:

First generation: Pure soybean oil, rich in polyunsaturated omega-6 fatty acids
Second generation: Mixtures of soybean oil and medium-chain triglycerides (MCT)
Third generation: Addition of olive oil or fish oil for omega-3 fatty acid enrichment
Fourth generation: Combinations of soybean oil, MCT, olive oil, and fish oil (e.g., SMOFlipid)

Indications

Parenteral Nutrition

The most common use of lipid infusions is in parenteral nutrition -- the delivery of nutrients directly into the bloodstream when oral or enteral feeding is not possible. Lipid infusions provide a concentrated energy source (approximately 9 kcal per gram of fat) and supply essential fatty acids that the body cannot produce on its own. They are used in patients after major surgery, in severe gastrointestinal disease, or in intensive care settings.

Lipid Rescue Therapy

A specialized indication is lipid rescue therapy, in which high-dose lipid emulsions are used to bind and neutralize lipid-soluble toxic substances in the bloodstream -- most notably local anesthetics such as bupivacaine. This treatment is used as an emergency intervention in cases of local anesthetic systemic toxicity (LAST), helping to protect the heart and nervous system from life-threatening effects.

Dosage and Administration

Lipid infusions are typically administered via a central or peripheral venous catheter. Dosing is based on body weight, energy requirements, and the clinical condition of the patient. In parenteral nutrition, the recommended dose is generally 0.7 to 1.5 g of lipids per kilogram of body weight per day. In lipid rescue therapy, an initial bolus of 1.5 ml/kg of a 20% lipid emulsion is recommended, followed by a continuous infusion.

Side Effects and Risks

Lipid infusions are generally well tolerated, but may cause the following side effects:

Hypertriglyceridemia (elevated blood lipid levels) with excessive dosing
Fatty liver with prolonged use
Infection risk associated with venous access
Allergic reactions, particularly in patients with egg or soy allergies
Thrombophlebitis (vein inflammation) with peripheral administration
In rare cases: fat embolism

Contraindications

Lipid infusions should not be used in patients with:

Severe hypertriglyceridemia (blood triglycerides above 400 mg/dL)
Known allergy to soy, peanuts, or eggs
Severe liver failure
Acute pancreatitis with accompanying hyperlipidemia

References

Singer P. et al. - ESPEN guideline on clinical nutrition in the intensive care unit. Clinical Nutrition, 2019; 38(1):48-79.
Weinberg G. et al. - Lipid emulsion infusion: resuscitation for local anesthetic and other drug overdose. Anesthesiology, 2012; 117(1):180-187.
Pironi L. et al. - ESPEN guidelines on chronic intestinal failure in adults. Clinical Nutrition, 2016; 35(2):247-307.

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