Randomized comparison between dexmedetomidine and midazolam for prevention of emergence agitation after nasal...

Emergence agitation (EA) in nasal surgeries is seen in around 22% of patients, which can go to dangerous levels. Dexmedetomidine is effective in prevention of EA in such patients. Midazolam given as premedication fails to prevent EA due to its short half-life. In this study, we compared efficacy of dexmedetomidine and midazolam by intravenous infusion for prevention of EA in adult nasal surgeries.

Seventy patients belonging to American society of anesthesiologist Status I and II, between 18 and 60 years of age posted for elective nasal surgeries were randomly divided into two groups. Group D received intravenous dexmedetomidine 0.5 mcg/kg over 15 min followed by 0.1 mcg/kg/h. Group M received intravenous midazolam 0.02 mg/kg over 15 min followed by 0.02 mg/kg/h. EA scores, emergence times, and hemodynamic parameters were monitored and compared between the groups. Statistical analysis was done by independent t-test, Mann-Whitney U-test, and Chi-square test as applicable.

Incidence of EA was comparable between the groups (P = 0.23). Two patients in midazolam group developed dangerous agitation while none in dexmedetomidine group. Patients in midazolam group (12.4%) were agitated even in postoperative period, which was not seen with dexmedetomidine group. Hypotension and bradycardia were seen more in dexmedetomidine group.

Efficacy of midazolam when given as an intravenous infusion is comparable to dexmedetomidine in prevention of EA in nasal surgeries.