This document discusses using ultrasound to confirm endotracheal tube placement. It states that ultrasound is a simple, fast, and reliable adjunct technique that can be used when other confirmation methods like capnography are unreliable or not available. There are two ultrasound techniques described - direct (transtracheal) ultrasound looks inside the trachea or esophagus to see if the tube is correctly placed, while indirect (transthoracic) ultrasound looks for movement of the pleura indicating lung ventilation. Ultrasound is not meant to replace capnography and auscultation but can be a helpful additional method in emergency situations or for patients who are not responding as expected after intubation. The document provides details on how to