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We aimed to measure gastric antral cross‐sectional area with ultrasound and estimate the gastric volume of 300 patients before unplanned surgery, fasted for at least six hours. Measurements were successfully recorded in 263 semi‐recumbent patients. The median (IQR [range]) area was 333 (241–472 [28–1803]) mm2 and the mean (SD) estimated volume was 45.8 (34.0) ml. The area exceeded 410 mm2 in 92/263...
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