Dynamic assessment of gastric emptying patterns after endoscopic bowel preparation using ultrasonography: A prospective observational study
Authors' conclusion
Gastric emptying after PEG-based bowel preparation is relatively rapid, with a substantial portion of patients reaching a low-risk gastric state within two hours.
Study context
- Population
- ASA I–II patients scheduled for elective endoscopy after oral polyethylene glycol (PEG) bowel preparation
- Participants
- 150 patients
- Outcome
- Target Attainment: antral cross-sectional area < 340 mm² on gastric ultrasonography (low aspiration risk)
Methodological detailssingle-centre, Antral cross-sectional area (CSA) measured by a trained anesthesiologist at 0, 1, 2, 3 and 4 h after completion of oral PEG solution
- Single-centre
- Antral CSA measured by a trained anesthesiologist at 0, 1, 2, 3 and 4 h after completion of oral PEG solution
Main finding
As reported in the abstract
Cumulative probability of target attainment (Kaplan-Meier)
At 2 h
68.7%
At 3 h
90.0%
By 4 h
100%
Observational data: associations, not effects.
Further findings
Predictors of target attainment at 2 h (multivariate logistic regression)
- Model combining BMI and diabetes status: AUC (fair discrimination)
- 0.713
- Diabetes a significant predictor of delayed gastric emptying
- Higher BMI (overweight) associated with faster emptying vs normal weight
Original publication
Dynamic assessment of gastric emptying patterns after endoscopic bowel preparation using ultrasonography: A prospective observational study. J Clin Anesth. Published 13 May 2026. doi:10.
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