Background: There has been a renewed focus on offering commercial formulas made with real-food ingredients because of their perceived health benefits, such as improved feeding tolerance and gut health. Children receiving enteral nutrition through these formulas often are fed via feeding pumps. Because these formulas vary in thickness, we aimed to explore the relationship between formula thickness and prescribed formula delivery via feeding pumps. We hypothesized that inaccurate volumes of commercial blenderized formula (CBF) are delivered via feeding pumps and that these inaccuracies are directly proportional to the thickness of the formula.
Methods: We performed International Dysphagia Diet Standardisation Initiative (IDDSI) tests for six de-identified CBFs. We then ran these formulas over three feeding pumps using nasogastric and gastric tubes and simulated continuous and bolus feeds. We calculated the difference between programmed volume and actual delivered volume.
Results: Moderate and extremely thick formulas (IDDSI level 3-4) delivered a median of 22.5% less volume than programmed in the pump (P < 0.001). In addition, there was a 25.5% reduction in delivered volume for thick formulas compared with thin formulas. This occurred despite using the manufacturer's recommendations for suggested tube size.
Conclusion: Thicker CBF can provide inaccurate volumes via feeding pumps, which may contribute to poor weight gain when children are switched to these formulas. Based on these findings, we recommend best practices for using these formulas. More studies are needed to investigate the best formula consistency to optimize delivery and caloric intake.
Keywords: blenderized formula; enteral nutrition; pediatrics.
© 2023 American Society for Parenteral and Enteral Nutrition.