表 2.

两组患者胃超声测量值及Perlas A半定量评级比较

Main ultrasound data and Perlas A grading scale in two groups

Items	Intervention group (n=40)	Control group (n=40)	Statistical value	P
CSA, antral cross-sectional area; RLD, right lateral decubitus position; GV/W, gastric volume /weight.
CSA in supine/(mm2), x±s	378±111	384±114	t=0.263	0.793
CSA in RLD/(mm2), x±s	566±173	572±163	t=0.167	0.868
Gastric volume/mL, x±s	58.8±23.6	56.3±22.1	t=－0.491	0.625
GV/W/(mL/kg), x±s	0.97±0.39	0.95±0.35	t=－0.170	0.865
Perlas A grade, n (%)			Z=－0.130	0.897
0	24 (60)	25 (62.5)
1	15 (37.5)	13 (32.5)
2	1 (2.5)	2 (5)