Comparing between dexmedetomidine versus low dose ketamine infusion in patients undergoing nasal and paranasal sinus surgery as regard, intraoperative hemodynamic stability, blood loss, perioperative opioid requirements, Stress response evaluation through the measurement of serum level of cortisol, IL-6, blood glucose and CRP.
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The postoperative pain
Timeframe: from 0 hours to 24 hours after the procedure