Sevoflurane Sedation as an Alternative for Awake Fiberoptic Intubation in Difficult Airway Patients

Inclusion Criteria: * Age from 18 to 50 years. * Both sexes. * American Society of Anesthesiology (ASA) physical status I-II. * Patients with difficult airway (Mallampati grade 3 and 4 with mouth opening less than 5 cm). Exclusion Criteria: * Patient refusal. * Patients with bleeding disorders and nasal mass. * Allergy or intolerance to one of the study medications. * Patients with uncontrolled systemic diseases. * patients with gastro-esophageal reflex. * history of nasopharyngeal surgery or drug abuse.