Structured triglyceride emulsions in parenteral nutrition

Area of Science:

• Nutritional Science
• Biochemistry
• Clinical Nutrition

Background:

• Intravenous fat emulsions (IVFE) have evolved over 30 years.
• A novel structured-lipid emulsion, utilizing older technology, is now available.
• This emulsion is synthesized by combining medium-chain and long-chain triglycerides.

Purpose of the Study:

• To evaluate the efficacy and safety of a newly available structured-lipid emulsion.
• To compare its effects on nitrogen balance, lipid metabolism, and liver function against standard IVFE formulations.
• To assess its impact on the reticuloendothelial system.

Main Methods:

• Animal studies demonstrated improved nitrogen balance with structured-lipid emulsions.
• Eight human clinical studies were conducted to assess clinical outcomes.
• Comparisons were made against long-chain triglycerides (LCT) and LCT-medium-chain triglycerides (LCT-MCT) mixtures.

Main Results:

• Human clinical study results were less promising than animal data.
• Structured-lipid emulsions showed improved nitrogen balance and lipid metabolism over LCT and LCT-MCT.
• These emulsions resulted in less elevation of serum liver function values and no adverse effects on the reticuloendothelial system compared to standard IVFEs.

Conclusions:

• Structured-lipid emulsions offer potential advantages over standard IVFE, including better nitrogen balance and lipid metabolism.
• While promising, further clinical studies are essential to establish definitive recommendations for their use.
• Future developments aim for chemically defined structured triglycerides for targeted clinical applications.