Inclusion Criteria:  patients who will undergo major abdominoplasty, over the age of 18, under the age of 85, patients who has ASA (American Society of Anesthesiologists) II and ASA III criteria  Exclusion Criteria:  younger than 18 years old, over 85 years old, Having a history of cerebrovascular disease Having surgery other than oncological surgery having coagulation disorder being illiterate having visual and auditory problems Inability to cooperate with cognitive function test having an emergency surgery Those who are not able to read and sign the consent form Patients deemed unsuitable by the researcher Patients who do not want to participate