In vitro flow rates of enteral solutions through nasoenteric tubes

Enteral solutions must flow freely through nasoenteric tubes selected for gravity drip administration particularly in outpatients receiving nutritional support. This study determined in vitro flow rates of solutions with intact protein and hydrolyzed protein sources with various caloric densities. Each solution was infused through silicone rubber and polyurethane tubes of various lengths and bore sizes. Flow rates were measured five times at 25 degrees C using formula bags and drip sets hung at a uniform height and tubes uniformly positioned in a collecting vessel. Data are presented for tubes and formulas tested. Recommendations for selection of tubes for gravity drip administration are made based on flow rate data, patient comfort, administration convenience, and patient tolerance to osmolality.