Effect of Different Feeding Method on Gastrointestinal Function of Critical Patients

Daily amount of feeding were continuously pumped for 24 hours. EN preparation pumping scheme was as follows: The initial pumping speed was average pumping volume of total enteral nutrition in one day, and gastric residual volumes is checked every 4 hours. If it is not tolerable, the speed of the pumping is reduced by half on the original speed. GRV\<200mL were considered markers of good tolerance.Feeding intolerance was defined as GRV\>200 mL. If GRV\>500mL, EN was stopped and reassessed after 4 hours.

Daily amount of feeding were continuously pumped for 16 hours.EN preparation pumping scheme was as follows: The initial pumping speed was average pumping volume of total enteral nutrition in one day, and gastric residual volumes is checked every 4 hours.If it is not tolerable, the speed of the pumping is reduced by half on the original speed. GRV\<200 mL were considered markers of good tolerance. Feeding intolerance was defined as GRV\>200 mL. If GRV\>500mL, EN was stopped and reassessed after 4 hours.

Daily amount of feeding were divided into four meals, each meal are pumped within 60mins or 120mins through stomach tube. EN preparation pumping scheme was as follows: If the volume of each meal is less than or equal to 250ml(≤250ml), pump in within 60min, if volume is greater than 250ml(\>250ml), pump in within 120min and gastric residual volumes is checked before each intermittent feeding. If it can be tolerated, the velocity of the pumping can be increased by half of the original speed.If it is not tolerable, the speed of the pumping is reduced by half on the original speed. GRV\<200 mL were considered markers of good tolerance. Feeding intolerance was defined as GRV\>200 mL. If GRV\>500mL, EN was stopped and reassessed after 4 hours.