Table 3.

Two-Diameter Method was used to measure CSA-GA by ultrasound. Stomach volume was estimated and calculated by ESV = 27.0 + 14.6 × CSA-1.28 × age (years). Compared with before jet ventilation, CSA-GA and ESV after jet ventilation had not been increased in the WNJ SJOV group (p > 0.05)

Monitored variables	Before WNJ SJOV (N = 34)	After WNJ SJOV (N = 34)	P-Value (before VS after)
CSA-GA (cm2)	3.32 ± 0.59	3.34 ± 0.56	0.234
ESV (ml)	18.78 ± 6.68	18.89 ± 6.59	0.777

CSA-GA cross sectional area of the gastric antrum, ESV Estimated stomach volume, SJOV supraglottic jet oxygenation and ventilation, WNJ Wei nasal jet tube