The aim of this study is to evaluate the difference of the gastric volume by quantitative measurements of gastric antrum preoperatively and postoperatively by using 5mg famotidine versus placebo as a risk factor of PONV.

Gastric ultrasound examinations will be performed preoperatively and postoperatively on patients undergoing emergency surgery in pediatric. Gastric cross-sectional area (CSA) will be measured, in order to estimate the gastric volume. The data that will be obtained will be used to evaluate a difference of the gastric volume between the two groups preoperatively and postoperatively and the possible relationship between the gastric volume difference and postoperative adverse event (PONV).

Inclusion Criteria:

• Pediatrics patients aging between 2-13 years .
• pediatrics undergo urgent surgery (i.e., surgery that cannot be postponed for more than 48 h since clinical onset).
• PatientPediatrics come in trauma

Exclusion Criteria:

• PatientPediatrics severly shocked .
• PatientPediatrics with diffusely distended abdomen as this will obstacle gastric ultrasound .
• PatientPediatrics with history of hypersenstivity to famotidine .
• PatientPediatrics with hepatic or renal impairments