As individuals age, they often enter a phase of increased "frailty." Elderly and frail patients represent a population that requires heightened sensitivity and close monitoring during surgical procedures. This study aims to investigate the relationship between the Hemoglobin-to-Red Blood Cell Distribution Width (Hb/RDW) ratio and perioperative hypothermia in elderly patients undergoing transurethral prostatectomy. This is an observational study. Preoperative blood test results and intraoperative body temperature measurements of the patients will be recorded in our data forms.

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.

Etlik City Hospital, Urology Operating Rooms

The data that support the findings of this study are available on request from the corresponding author, (GK). The data are not publicly available due to our participants' informed consent forms.