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Study aim
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Comparison the effects of dexmedetomidine and Labetalol for induced hypotension in maxillofacial fractures surgery
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Design
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Patients in the first group receive dexmedetomidine with bolus infusion of 1 µg / kg / h and maintenance dose of 3.0 -5.0 µg/kg/h and in the second group receive infusion of labetalol with bolus dose of 0.3 mg/kg/h and maintenance dose of 0.2-0.5 mg/kg/h .
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Settings and conduct
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The place of study is operation room of Shahid Rajaee Hospital in Qazvin. 0.02 mg/kg of midazolam and 1.5 mg/kg of fentanyl will be used for sedation, 5 mg/kg of lidocaine and 2 mg/kg of propofol will be used for induction of anesthesia and 0.5 mg/kg of atracurium were used as muscle relaxants. Following surgery and stabilization of the patient's hemodynamic status and due to the color of the cards, dexmedetomedine was used in one group and labetalol in the other group. Patient, surgeon, outcome assessor, and statistician were unaware of the type of intervention.
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Participants/Inclusion and exclusion criteria
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Inclusion criteria are age 18 to 60 years, ASA class 1 and 2 and fracture of mandible or maxilla. Exclusion criteria are ASA 3 and more, heart block, heart failure, unstable hemodynamics, depression, renal failure, Raynaud's phenomenon, sensitivity to lidocaine or beta-blockers, deformity of trachea and lack of consent to participate in the study.
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Intervention groups
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In this study, two intervention groups, including the Dexmedetomidine and the Labetalol treatment groups, will be used to induce hypotension in surgery.
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Main outcome variables
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Systolic blood pressure, diastolic blood pressure, mean arterial pressure