the Investigators aim to study the effect of fentanyl with topical levobupivacaine with nasal packing in endoscopic nasal surgery

Inclusion Criteria:1. All patients in the age of 18-60 year 2. ASA I-II 3. Undergoing elective nasal endoscopic surgery

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Exclusion Criteria:

1. Patients will also be excluded if any perioperative cardiovascular or respiratory event occurred which the anaesthetist with clinical responsibility for the patient thought would make the study intervention clinically unacceptable.
2. unsatisfactory preoperative peripheral arterial oxygen saturation.
3. Unsatisfactory preoperative hemoglobin level.
4. Neurological or psychiatric disease.

Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)