Comparison of Ultrasound Methods for Assessment of Endotracheal Tube Placement

Inclusion Criteria: * Patients in the emergency department who require endotracheal intubation (ETI) based on the decision of the primary physician and are intubated using the rapid sequence intubation method. * Patients aged \>18 years will be included in the study. Exclusion Criteria: * Pregnant patients. * Patients with a history of neck or chest surgery that may interfere with ultrasound evaluation. * Patients with cervical spine disease or a history of surgery that could affect diaphragmatic movement. * Patients diagnosed conditions such as pneumothorax that could affect lung ultrasound results, or those in whom pneumothorax is detected upon further evaluation, * Patients who, after being enrolled, withdraw consent either personally or through a relative.