Feasibility of Nurse-performed Gastric Ultrasound After Surgery

Patients will be scanned in both supine and right lateral decubitus position (RLD)s. If the antrum is visible, it will be judged if the antrum is empty in both positions or the antrum is empty in supine position and fluid apparent in RLD position suggesting a low fluid volume (\<1,5 ml/Kg). The third option is fluid apparent in both supine and RLD position, suggesting a higher fluid volume (\>1,5ml/Kg) and the last option is solid food in one or both positions.