Cerebral and Peripheral Near Infrared Spectroscopy Monitoring in Low and High Flow Anaesthesia in Pediatric

Inclusion Criteria: * Between 2-12 years of age, those who are planned to undergo pediatric surgery, orthopedic and urological surgery, and whose procedure time is 1 hour or more * ASA I-III risk group * Patients who agreed to be included in the study * Patients whose informed consent form is approved by their parents will be included in the study. Exclusion Criteria: * Patients who do not want to participate in the study * Patients with ASA score above III * ASA III patients with decompensated cardiac and pulmonary disease * Patients with neurological sequelae * Cases with an operation duration of less than 1 hour * Patients with contraindications to the use of any anesthetic drugs * Patients for whom low-flow anesthesia is contraindicated * Smoke and gas poisoning * Malignant Hyperthermia * Septic Shock * CO2 absorbent depletion * Insufficient oxygen monitoring * Laparoscopic surgeries * Patients who develop unexpected intra-operative surgical complications * Patients whose parents do not approve the informed consent form will not be included in the study.