A comparative study between Magnesium Sulphate and Nitroglycerin with Propranolol in controlled hypotensive anaesthesia during middle ear surgeries

Abstract

Controlled hypotension is used and performed in operations that require a bloodless field to facilitate surgeon’s vision. This may be important since a small amount of blood may interfere greatly with the surgeon's vision during the surgery, for example during middle ear surgery. The aim of our study is to compare magnesium sulphate and nitroglycerin with propranolol during middle ear surgery in terms of regarding their efficiency in inducing deliberate hypotension and providing a better surgical field exposure during middle ear surgery. It also compared the influence of their use to control postoperative pain. Forty adult patients undergoing middle ear surgery were included. Patients were randomly divided into two equal groups. Patients were assigned to receive magnesium sulphate (M group) and nitroglycerin with propranolol (N group). Patients are ASA physical status I, age group ranged from 18 to 45 years.