Oral clonidine: an effective adjuvant in functional endoscopic sinus surgery

摘要

Background: A comparative study to evaluate the efficacy of intravenous Dexmedetomidine as a hypotensive agent in comparison to oral Clonidine in Endoscopic Nasal Surgery or Functional Endoscopic Sinus Surgery (FESS). Methods: Forty patients ASA I or II scheduled for Endoscopic Nasal Surgery were equally randomly assigned to receive either dexmedetomidine 1μg/Kg over 10 min before induction of anesthesia followed by 0.5μg/Kg/h infusion during maintenance (Group D), or oral Clonidine (Group C) 2μg/kg with minimal water 1 hour prior starting of surgery. Rescue bolus doses of Propofol (10mg/dose) were given to maintain mean arterial blood pressure (MAP) between (50-70mmHg). General anesthesia was maintained with Isoflurane 1%-2%. The surgical field was assessed using Average Category Scale. Hemodynamic variables (MAP and HR) were recorded at 10 minutes interval. Results: Both group C and group D reached the desired MAP (50-70mmHg) with no intergroup differences in HR but a statistically significant lower MAP was noticed in group C. The quality of the surgical field in the range of MAP (50-70mmHg) were 2-3 as per average category Scale with significantly lower score in Group C. Mean intraoperative propofol consumption was significantly higher in group D than C group. Conclusions: Both Dexmedetomidine or oral clonidine with isoflurane are safe agents for controlled hypotension, but oral clonidine provides lower MAP and better surgical field. Compared with Dexmedetomidine, oral clonidine offers the advantage of less consumption of propofol.