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| Characteristics of gastric emptying during entire water drinking process for bowel preparation in elderly patients undergoing colonoscopy under gastric antrum ultrasonography |
| ZHANG Lijuan1,2, SHI Haiyan3, LIU Ying2, LI Ting4, NIE Dan3, MA Yanlan5 |
1. Medical College of PLA,Beijing 100853,China;
2. Department of Hematology, 3. Department of Gastroenterology, the Second Medical Center of PLA General Hospital, Beijing 100853, China;
4. Department of Gastroenterology, the Third Medical Center of PLA General Hospital, Beijing 100039, China;
5. Health Service Training Center of PLA General Hospital,Beijing 100853, China |
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Abstract Objective To investigate the characteristics of gastric emptying during the entire water drinking process for bowel preparation for colonoscopy in elderly patients. Methods A total of 108 elderly patients who underwent colonoscopy in two grade A hospitals in Beijing from April to September 2024 were selected. Gastric antral cross-sectional area (CSA) was measured via single-plane ultrasonography at fasting and after five water drinking intervals. Gastric emptying rate (GER) was calculated using a standardized formula. Results Ninety-nine elderly patients completed gastric antral ultrasonography monitoring. The first defecation occurred between the 1st and 4th water drinking intervals. The gastric antral CSA reached its peak (mean: 32.94 cm2-38.64 cm2, equivalent to 500 ml-600 ml) immediately after the 3rd water intake. Post-defecation gastric emptying rates were significantly higher than pre-defecation rates (47.54%-55.09%, P< 0.05). Conclusions Gastric emptying is delayed during the early phase of water intake for bowel preparation in elderly patients but accelerates after the first defecation. Tailoring hydration strategies based on these gastric emptying characteristics may improve comfort and safety during bowel preparation.
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Received: 27 December 2024
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2025, Vol. 36 
