Pre-operative Phentolamine Vs Intraoperative Esmolol Efficacy for Hypotensive Anesthesia in Functional Endoscopic Sinus Surgery

Patients with a medical condition that contraindicated hypotensive anesthesia, such as peripheral vascular disease, cerebrovascular stroke, carotid artery stenosis, previous myocardial infarction, ischemic heart disease, congestive heart failure, limb ischemia, uncontrolled hypertension and raised intracranial tension

Renal disease, liver dysfunction, pregnancy.

Patients on hypnotic or narcotic analgesic.

History of alcohol or drug abuse.