Hemoglobin-to-red Blood Cell Distribution Width Ratio and Hypothermia for Elderly Patient

Inclusion Criteria: * Patients who provided informed consent. * Patients scheduled for transurethral prostatectomy surgery. * Patients classified as ASA-PS 1, 2, or 3. * Male patients aged 65 years or older. * Patients undergoing elective surgery. * Patients receiving general anesthesia. Exclusion Criteria: * Patients who did not provide informed consent. * Patients undergoing emergency surgery. * Patients with conditions that disrupt thermoregulation (e.g., intracranial mass, peripheral vascular diseases, sepsis). * Patients with a body temperature of \<34℃ or \>38℃ upon arrival at the preoperative waiting room. * Patients who used heating methods other than the routine cotton cover in the preoperative waiting room. * Patients who received additional heating methods other than the routinely applied intraoperative hot air blower drapes. * Patients undergoing surgery under any type of anesthesia other than general anesthesia. * Patients who were taken out of the operating room while intubated.