Background
Acute hypertension is a common accompaniment during emergence from anesthesia especially in intracranial neurosurgical procedures and may be associated with the development of intracranial hematoma. Although various drugs have been evaluated, management of emergence hypertension in this subset of patients continues to be a challenge for anesthesiologists.
Methodology
Seventy-five patients ASA (I-II) scheduled for supratentorial craniotomy under general anesthesia were randomly allocated to one of three groups at the time of dural closure: Group “dex” received dexmedetomidine infusion in a rate of 1 μg/kg/hr, Group “labetalol” received labetalol infusion in a rate of 0.5 mg/kg/hr, and Group “control” a control group where patients received saline infusion at the same rate of dexmedetomidine and labetalol. Hypertensive episodes were managed with nitroglycerin at a dose starting from 1 μg/kg/min if systolic blood pressure exceeded 25% of its preinduction value. Hemodynamic parameters as well as the number of patients, the total dose of nitroglycerin required in each group and the time to extubation were recorded.
Results
Dexmedetomidine and labetalol had a significant effect in reducing SBP, MAP, DBP, HR during emergence from anesthesia, with more reduction of the SBP, MAP and DBP in the dexmedetomidine group and of the HR in the labetalol group in comparison with the other two groups. The number of patients needing nitroglycerin was 8 representing 32% of patients in dexmedetomidine group, 5 representing 20% of patients in labetalol group and 22 representing 88% of patients in control group ( value = 0.032). Time to emergence from anesthesia was comparable in the three groups.
Conclusion
Both dexmedetomidine and labetalol had favorable effects on hemodynamics at time of emergence from anesthesia in comparison with control group without prolongation of the time of extubation.