The purpose of study aims to determine which of the three different oxygenation strategies, including nasal cannula, modified nasopharyngeal cannula, and HFNO groups, is safer in patients undergoing bronchoscopy under sedation.

The patients will be evaluated in the anesthesia polyclinic before the procedure, routine preparation will be made, and written informed consent will be obtained. After being informed about the study and potential risks, all patients who gave written informed consent will be enrolled in the study by recording their demographic information after determining whether they are eligible to participate in the study. In addition, STOP-BANG and FRAIL fragility questionnaires will be administered to the patients. Which oxygenation method should be used which patient will be left to the decision of the Anesthesiologist; The oxygenation tools used in the bronchoscopy unit are nasal cannula, modified nasopharyngeal cannula, and HFNO. When the patients are taken to the procedure room, anesthesia management will be applied by the standard working order of the anesthesia clinic. In addition to non-invasive arterial blood pressure monitoring, 5-channel ECG and pulse oximetry, and standard hemodynamic monitoring, Bispectral Index (BIS) monitoring will be performed. During the process, oxygen saturation will be continuously monitored and the lowest value will be recorded. Interventions made in cases of low oxygen saturation will also be recorded. At the end of the procedure, the patient will be taken to the recovery unit after waking up.

Inclusion Criteria:

• All patients undergoing bronchoscopy

Exclusion Criteria:

• Do not have the ability to read, understand and sign the consent form
• Pregnancy
• Contraindications to anesthetic drugs
• Hemodynamically unstable patients
• Having a peripheral vascular disease
• Intubated patients
• Patients with tracheostomy

Patients admitted to the bronchoscopy unit for the procedure