A randomized controlled trial of 94 patients undergoing laparoscopic surgery under general anesthesia compared early oral rehydration under gastric ultrasound monitoring (intervention group, n=47) with a control group. The QoR-15 quality of recovery score was higher in the intervention group (136.0 vs. 114.0, p<0.001). NRS thirst scores were significantly lower at 2, 6 and 24 hours after surgery (p<0.001). The time to the first flatus was shorter by 4 hours (median 9.10 h vs. 13.10 h, p<0.001). The incidence of postoperative nausea and vomiting (PONV) decreased by 21.27% (10.64% vs. 31.91%, p=0.011). Median hospital stay was reduced by 1 day (3.0 days vs. 4.0 days, p<0.001). Ultrasound showed improvement in antral cross-section and volume below the safe threshold of 1.5 ml/kg without complications such as aspiration pneumonia.