Comparison of the Effects of Nicardipine and Remifentanil on Surgical Visual Field

Inclusion Criteria: * ASA I-II patients of both sexes, * aged 18-65 years, * scheduled for tympanomastoidectomy and decided to perform CH, Exclusion Criteria: * hypertension, * anticoagulant medication, * pregnancy * major hepatic, * renal, * cerebral, or cardiorespiratory dysfunction, * neurological or psychiatric disease * ASA 3-4, * Body Mass Index BMI≥35 kg/m2, * difficult intubation was considered (Mallampati score 3-4, a thyromental distance less than 6 cm, maximum mouth opening less than 3 cm), * the number of intubation attempts more than two, cases with allergies to any of the agents used in the study