• Yuming Tan, Xianchun Wang, Han Yang, Chuanlong Pan, Nanbo Luo, Junjie Li, Fang Yang, Yanling Bei, Zhen Cahilog, Qian Chen, Zhiheng Liu, and Xinping Yang.
• Department of Anaesthesiology, Shenzhen Second People's Hospital, Shenzhen University First Affiliated Hospital, Health Science Centre, Shenzhen, 518000, China.
• BMC Anesthesiol. 2022 Jan 12; 22 (1): 21.

BackgroundPatients undergoing gastroenteroscopy during sedation are prone to aspiration, and most patients with dyspepsia have delayed gastric emptying. This study aimed to investigate the feasibility of measuring the gastric antrum cross-sectional area (CSA) to supply a novel clinical diagnostic reference value in patients with dyspepsia.MethodsPatients with dyspepsia undergoing elective gastroscopy were included. The Perlas qualitative 0-2 grading scale score was determined before the operation. The anteroposterior diameter (D1) and craniocaudal diameter (D2) between gastric antrum serosal surfaces were measured perpendicular to each other in the supine and right lateral decubitus (RLD) positions. CSA values in the supine position and RLD position were determined. Gastric contents were endoscopically suctioned with the volumes measured and noted as actual gastric volume. Multiple regression analysis was used to fit a mathematical model for estimating the gastric volume. Receiver operating characteristic (ROC) curves were constructed to determine the accuracy of RLD CSA to detect gastric volumes of > 0.8 ml/kg.ResultsA total of 117 patients were enrolled and divided into a functional dyspepsia (FD) group and an organic dyspepsia group according to gastroscopy findings. For a gastric volume of > 0.8 ml/kg, cut-off values for FD and organic dyspepsia were 6.7 cm2 and 10.0 cm2, respectively. Two new modified mathematical models were derived to predict an estimated gastric volume for FD and organic dyspepsia: volume = 3.93 × RLD CSA - 0.47 × age; and volume = 6.15 × RLD CSA - 0.61 × age.ConclusionWe used the cut-off value of the antral area for the fast diagnosis of gastric volumes in patients with dyspepsia, which may assist clinicians in identifying patients at risk of aspiration.Trial Registrationwww.chictr.org.cn ( CHICTR-DDD-17010871 ); registered 15 March 2017.© 2022. The Author(s).

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