Characteristics of gastric emptying during entire water drinking process for bowel preparation in elderly patients undergoing colonoscopy under gastric antrum ultrasonography

ZHANG Lijuan; SHI Haiyan; LIU Ying; LI Ting; NIE Dan; MA Yanlan

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Medical Journal of the Chinese People Armed Police Forces ›› 2025, Vol. 36 ›› Issue (4) : 281-284.

Characteristics of gastric emptying during entire water drinking process for bowel preparation in elderly patients undergoing colonoscopy under gastric antrum ultrasonography

ZHANG Lijuan^1,2, SHI Haiyan³, LIU Ying², LI Ting⁴, NIE Dan³, MA Yanlan⁵

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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.

Key words

the elderly / bowel preparation / ultrasonography / transverse section of gastric antrum / gastric emptying rate

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ZHANG Lijuan, SHI Haiyan, LIU Ying, LI Ting, NIE Dan, MA Yanlan. Characteristics of gastric emptying during entire water drinking process for bowel preparation in elderly patients undergoing colonoscopy under gastric antrum ultrasonography[J]. Medical Journal of the Chinese People Armed Police Forces. 2025, 36(4): 281-284

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