Why is it important to ensure that TPN fat emulsions are not infused too rapidly?

• A. To prevent hyperglycemia
• B. To avoid fat embolism and vomiting
• C. To avoid infection
• D. To avoid constipation

Answer: (B)

The main idea is that lipid emulsions in TPN must be given at a controlled, slower rate to prevent the circulation from being overwhelmed by fat droplets. If the fat emulsion is infused too quickly, droplets can overwhelm the capillaries and travel to organs, potentially causing a fat embolism and impaired oxygenation. Rapid administration can also trigger gastrointestinal intolerance, such as vomiting, due to the sudden lipid load. Hyperglycemia, infection, and constipation are not primarily tied to the rate of lipid infusion—their risks relate more to carbohydrate content, line care, and other factors, respectively.