Effect of Operating Room Noise on BIS and Hemodynamics Under General Anesthesia

This prospective observational study aims to evaluate the impact of operating room noise on bispectral index (BIS) and hemodynamic parameters in patients undergoing general anesthesia. Environmental noise in operating rooms, often overlooked, may influence anesthesia depth, patient safety, and physiological stability. A total of 70 adult patients (ASA I-II, 18-65 years, elective surgery under general anesthesia) will be enrolled at Başakşehir Çam and Sakura City Hospital. Patients will be categorized into two groups based on intraoperative average noise levels: noisy group (\>65 dB) and quiet group (\

Inclusion Criteria: * Adults aged 18-70 * ASA (American Society of Anesthesiologists) physical status score I-II * Scheduled for elective surgery * To be undergoing general anesthesia * Having signed the informed consent form to participate in the study Exclusion Criteria: * Hearing impairment or ear pathology * History of neurological disease (epilepsy, stroke, dementia, etc.) * Use of psychiatric medications (anxiolytics, antidepressants, antipsychotics, etc.) * Indications for emergency surgery * Planned spinal or epidural anesthesia * Conditions unsuitable for BIS monitoring * Cognitive impairment preventing informed consent