Ultrasound to Check the Position of the Nasogastric Tube

The main objective of this study is to evaluate whether the use of ultrasound as a method of checking the normal positioning of the NGT is reliable, without requiring other diagnostic tests. Clinical trial that will include patients who had the NGT placed intraoperatively. 114 patients (57 with NGT and 57 without NGT) will be examined by ultrasound in the immediate postoperative period to diagnose the normal positioning of the NGT or its absence. Can ultrasound quickly and effectively diagnose the normal positioning of the NGT? Can chest X-ray be avoided by introducing ultrasound in the verification of the normal positioning of the NGT in the immediate postoperative period?