Developing a method for ultrasound estimation of gastric volume in patients with previous gastric sleeve
Authors' conclusion
The existing equation is likely still best suited for clinical use; however, the equation proposed here has superior accuracy in patients with prior gastric sleeve. A 2-hour fast from clear fluids is sufficient in this population.
Study context
- Population
- Subjects who had undergone a gastric sleeve in the last 10 years
- Participants
- 37 subjects
- Comparison
- Water 100 vs 200 vs 300 mL after 8-h solid and 2-h clear fluid fast
- Primary endpoint
- Performance of the current gastric volume equation and development of a new equation (ultrasound antral cross-sectional area)
Methodological detailsrandomly assigned drink volumes, up to three study visits per subject
- Randomly assigned drink volumes
- Up to three study visits per subject
Primary result
As reported in the abstract
Gastric volume estimation equation
New equation (LASSO): Volume (mL)=15.5×CSA (cm²)-0.28×Weight (kg)-0.75×Height (cm)+97.9; mean bias
<1 mL
95% limits of agreement
−51.2 to 51.2 mL
Further findings
Gastric emptying after 2-h clear fluid fast · 120 min
- Post-drink scans grade 0
- 93.2%
- All had calculated volume <1.5 mL/kg
Original publication
Developing a method for ultrasound estimation of gastric volume in patients with previous gastric sleeve. Reg Anesth Pain Med. Published 4 June 2025. doi:10.
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