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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)

From: Supraglottic jet oxygenation and ventilation for obese patients under intravenous anesthesia during hysteroscopy: a randomized controlled clinical trial

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

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