Table 2 Ultrasound-measured antral area and gastric volume by the gastric antral grades of FD

Supine position CSA (cm²)

3.9(3.0, 4.5)

4.2(3.2, 4.7)

0

0.333

RLD CSA (cm²)

6.1(4.5, 7.7)

8.9(6.7, 10.7)

0

< 0.0001

Actually measured volume (ml)

15(8.0, 18.0)

45(29.0, 52.5)

0

< 0.0001

Predicted gastric volume (ml)

57.9(47.8, 118.1)

109.1(75.0, 139.0)

0

< 0.0001

Gastric volume/unit body weight (ml/kg)

0.2(0.1, 0.4)

0.7(0.5, 0.9)

0

< 0.0001