Comparison of Hemodynamic Stability During Anesthesia Using Remimazolam and Sevoflurane in Minimally Invasive AVR

Inclusion Criteria: * Patients over 19 years old * Patients with severe aortic stenosis, undergoing minimally invasive aortic valve replacement surgery Exclusion Criteria: * Patients with known allergy to benzodiazepine, flumazenil, propofol * Patients with galactose intolerance, Lapp lactase deficiency, glucose-galactose malabsorption * Patients with hypersensitivity to Dextran40 * Patients who have been taking benzodiazepine for long term * Patients with whom heart rate assessment is not accurate, such as atrial fibrillation * Patients with end stage renal disease requiring hemodialysis * Patients with history of acute angle glaucoma * Patients with valve disease severity of grade III or higher, other than aortic valve * Emergency operation