111 Systematic review of definitions and outcome measures for postoperative ileus and return of bowel function after abdominal surgery in children Chapter 4 Table 2 – Specification of reported outcome measures Outcome measures Post-operative ileus Return of bowel function Reported in 18 articles Reported in 67 articles Total / unique outcomes reported 34 / 12 133 / 37 Number of used outcome measures 0 1 (6%) 0 1 6 (33%) 29 (43%) 2 5 (28%) 20 (29%) 3+ 6 (33%) 19 (28%) Outcome mentioned in method section as Primary 2 (12%) 7 (10%) Secondary 1 (6%) 2 (3%) Unclear 15 (82%) 58 (87%) Outcomes per article were related to return of Gastric motility 3 (17%) 32 (49%) Intestinal motility 0 7 (10%) Combination 15 (83%) 28 (41%) Definition provided for outcome 8 (44%) 0 Table 3 – Definitions reported for postoperative ileus Study (name, year, country) Term Definition Category Lander, 1997, UK Postoperative ileus Delay of enteral feeding due to persisting green nasogastric aspirates. Gastric motility Miyano, 2011, Japan Transient ileus Abdominal distention that began in the immediate postoperative period that resolved within 48 hours with nasogastric tube decompression. Both Gundeti, 2011, USA Temporary paralytic ileus Delayed oral intake of liquids to 72 hours post-surgery, and solids to 96 hours post-surgery Gastric motility López-Jaimez, 2016, Mexico Postoperative ileus Time from the end of surgical intervention to the time patients passed first flatus, had first bowel movement and tolerated oral intake. Both Bolmers, 2018, Netherlands Postoperative ileus No resumption of diet within 5 days Gastric motility Santos-Jasso, 2020, Mexico Absence of intestinal dysfunction, either ileus or mechanical bowel obstruction The presence of abdominal distention with or without abdominal pain, gastric or biliary vomiting, need for nasogastric decompression, and inability to pass gas or stool. Both Amanollahi, 2013, Iran Severe long lasting post-operative ileus Severe post-operative abdominal distension and vomiting. Both Chowdhary, 2016, India Prolonged gastric ileus Delay of the initiation of oral feeds by 14 days (one case) Gastric motility
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