Inclusion Criteria:  ASA1 and ASA2 patients Patients over the age of 18 Patients suitable for spinal anesthesia Patients who agreed to participate in the study with informed consent Patients who will have an elective cesarean section  Exclusion Criteria:  ASA3 and ASA4 patients Patients younger than 18 years old Patients for whom spinal anesthesia is contraindicated Patients who are hemodynamically unstable Patients to be taken to emergency cesarean section Patients with drug allergies Patients with finger deformities that prevent the insertion of the saturation probe Patients who did not agree to participate in the study