The aim of the study was to evaluate the preoxygenation time by observing patients undergoing preoxygenation with CPAP (Continuous Positive Airway Pressure) and Mask Ventilation in the clinic.

Criteria for inclusion in the study:

Planned elective bariatric surgery under general anesthesia ASA 1-2 class Between 20-50 years 50 patients

1. Group: Patients undergoing CPAP (Continuous Positive Airway Pressure) during preoxygenation will be included.
2. Group: Patients undergoing preoxygenation without CPAP will be included

In both groups, the time from the anesthesia device to the endtidal O2 90% and the endtidal CO2 value in this order will be recorded.

Heart rate, blood pressure, endtidal O2 and CO2 values will be recorded during preoxygenation and after intubation.

Inclusion Criteria:

• Inclusion Criteria:

  1. Patients between the ages of 20 and 50 years
  2. American Society of Anesthesiologists I, II or III
  3. Patients with body mass index of 40 and over

Exclusion Criteria:

1. cardiopulmonary disease
2. patients with previous abdominal or thoracic surgery or cerebrovascular disease
3. story of intracranial hypertension or epilepsy
4. patients with a story of difficult tracheal intubation