Fig. 1From: Risk estimation for postoperative nausea and vomiting: development and validation of a nomogram based on point-of-care gastric ultrasoundA Schematic diagram of ultrasonic probe placement. B Ultrasound examination of the gastric antrum. GA, gastric antrum; L, liver; P, pancreas; SMA, superior mesenteric artery; CT, coeliac trunk; AO, aorta. C The CSA measurement is based on the anteroposterior diameter and craniocaudal diameter. CSA, cross-sectional areaBack to article page