BACKGROUND: Postoperative agitation is harmful for the patient as it may be associated with removal of catheters, nasal packs, oxygen masks and self-injury, and pose a danger to operating theatre staff. OBJECTIVE: The current study investigated the potential role of magnesium sulphate in treatment of postoperative agitation following functional endoscopic sinus surgery. DESIGN: A randomised, double-blinded, placebo-controlled trial. SETTING: ENT operating room, Menofia University Hospitals, Egypt. PATIENTS: A total of 312 adult patients (171 men and 141 women) were enrolled in the study. Eighteen patients (10 men and eight women) were excluded; data from 294 patients were analysed. Inclusion criteria were age between 20 and 60 years, American Society of Anesthesiologists' physical status 1 or 2 scheduled for functional endoscopic sinus surgery. Exclusion criteria were hypertension, cardiac ischaemia, cerebrovascular insufficiency, neuromuscular diseases, pregnancy, prolonged treatment with calcium-channel blockers, diabetic neuropathy or a known allergy to magnesium compounds. INTERVENTIONS: Patients were allocated randomly to either the magnesium group (a magnesium infusion of 30 mg kg-1 in the first hour followed by 9 mg kg-1 h-1 until the end of the surgical procedure) or the control group (0.9% saline at the same volume and rate). Hypotensive anaesthesia was induced by nitroglycerine 5 to 20 [mu]g kg-1 min-1. In the postanaesthetic care unit (PACU), patients were assessed for agitation and pain using the Richmond agitation-sedation scale and numerical rating scale, respectively. PRIMARY OUTCOME: The incidence and severity of agitation measured 5 min after admission to the PACU. RESULTS: Magnesium reduced postoperative agitation at time 0 (P = 0.009) and 5, 10, 15 and 30 min after PACU admission (P
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