Comparison of Double Lumen Tube Location Verification Techniques in Single Lung Ventilation

Inclusion Criteria: * Patients who will undergo TAV and be placed in the lateral position. * Patients with ASA scores of I-III. * Patients aged 18-84. Exclusion Criteria: * Patients undergoing emergency surgery * Patients with American Society of Anesthesiology (ASA) IV and above * Patients with anticipated difficult intubation * Patients requiring intubation with a right thoracic duct (CLT) * Patients with more than three intubation attempts * Patients who refuse to participate in the study * Patients who will undergo TAV but will not be placed in the lateral position (sympathectomy) * Patients with uncontrolled metabolic disease * Mentally retarded patients * Patients under 18 or over 84 * Patients with tracheal or airway abnormalities * Pregnant or breastfeeding women