A Trial of Dexmedetomidine Hydrochloride Nasal Spray in Preoperative Sedation of Adults

Inclusion Criteria: 1. Able and willing to provide a written informed consent 2. Subjects requiring elective general anesthesia surgery 3. Male or female 4. Meet the weight standard 5. Conform to the ASA Physical Status Classification Exclusion Criteria: 1. Not suitable for nasal spray 2. Subjects who had received general anesthesia 3. Subjects with a history of myocardial infarction or unstable angina pectoris 4. Subjects with atrioventricular block or cardiac insufficiency 5. Subjects with a history of ischemic stroke or transient ischemic attack 6. Subjects with poor blood pressure control after medication 7. Subjects with abnormal clotting function 8. Subjects with a history of mental illness and a history of cognitive impairment epilepsy 9. Subjects with a history or possibility of a difficult airway 10. Subject with a history of substance abuse and drug abuse 11. Adrenoceptor agonists or antagonists were used before randomization 12. Abnormal values in the laboratory 13. Thyroid dysfunction 14. Allergic to a drug ingredient or component 15. Pregnant or nursing women 16. No birth control during the specified period of time 17. Participated in clinical trials of other drugs (received experimental drugs) 18. The inestigators determined that other conditions were inappropriate for participation in this clinical trial