Effect of Low Tidal Volume Ventilation on Postoperative Delirium

Inclusion Criteria: * All male or female patients over the age of 18 * Patients undergoing planned cardiac surgeries including CABG * Patients with an American Society of Anesthesiologists (ASA) physical status of II, III, or IV Exclusion Criteria: * Emergency surgeries will be excluded due to the high likelihood of non-compliance with the protocol and the potential lack of essential patient information. * Surgeries requiring single-lung ventilation will be excluded as they may cause confusion in determining any effects of the intervention due to the inability to apply the study intervention and the differential treatment of the lungs. * Patients who meet delirium criteria according to 3D-CAM measurements during the initial visit will be excluded. * Patients with a life expectancy of less than 6 months or a history of psychiatric or neurological diseases (including depression, severe central nervous system depression, schizophrenia, epilepsy, Parkinson's disease, and Alzheimer's disease) will be excluded. * Severe impairments such as blindness, severe deafness, or dementia that may hinder cognitive testing will be excluded. * Patients using psychotropic or opioid medications, those with a history of delirium, or those with a history of alcohol abuse or withdrawal within the past 6 months will be excluded.