Inclusion Criteria:  According to the American Society of Anesthesiologists (ASA), physical condition I-II, Elective otolaryngology surgery with endotracheal intubation planned Patients aged 50 and over  Exclusion Criteria:  Hypersensitivity to drugs Difficult intubation history Diabetes mellitus receiving insulin therapy Chronic renal failure or end-stage renal disease Heart failure (left ventricular ejection fraction ≤30%) Valve disease (moderate to severe) Atrial fibrillation