الفهرس 
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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.
We found that the two groups of drugs had the ability to
maintain hypotensive anesthesia and provide a fair surgical
field environment with no statistically difference between two
groups. In controlling post-operative pain, Magnesium Sulphate
group found to have good control of post-operative pain than in
Nitroglycerin with Propranolol group.There was no bradycardia nor tachycardia in either
groups. The surgical field was good in both groups and blood
pressure was controlled in both groups.