Clinical assessment of gastric contents before cesarean section: antral cross-sectional area measured using ultrasonography / 中华麻醉学杂志

ABSTRACT

Objective To assess the gastric contents before cesarean section using antral cross-sectional area (CSA) measured by ultrasonography.Methods One hundred and seventy-seven American Society of Anesthesiologists physical status Ⅰ-Ⅲ patients,aged 20-44 yr,undergoing cesarean section,were enrolled in this study.The antral CSA in the semi-recumbent and right lateral decubitus positions was measured through the ultrasound images of the antrum in the sagittal plane below xiphoid before anesthesia and qualitatively graded.Qualitative grade 0 was considered as the gold standard,and the receiver operating characteristic (ROC) curve of CSA in assessing the preoperative gastric contents was plotted.Results The critical value of ROC curve of CSA in the semi-recumbent position was 6.025 cm2.The critical value of ROC curve of CSA in the right lateral decubitus position was 9.095 cm2.Conclusion CSA ＜ 6.025 cm2 measured by ultrasonography in the semi-recumbent position or CSA＜9.095 cm2 measured by ultrasonography in the right lateral decubitus position can confirm that the gastric emptying state is achieved before cesarean section.