Comparing Different Doses of Dexmedetomidine in Attenuating Extubation Response in Hypertensive Patients Undergoing Laparoscopic Cholecystectomy

Background: Tracheal extubation is always linked with hypertension, tachycardia, and high-plasma catecholamine levels. These hemodynamic fluctuations are seen more often in hypertensive patients than in normotensives. The present study evaluates the effects of three different doses of dexmedetomidine in hypertensive patients relative to each other in attenuating extubation response. Patients and Methods: In this randomized, controlled, triple-blinded study, 105 controlled hypertensive patients of either sex on antihypertensive drugs in the age group of 30–70 years, scheduled for laparoscopic cholecystectomy were included. They were randomized into Groups A, B, and C receiving 0.5 μg/kg, 0.75 μg/kg, and 1 μg/kg of dexmedetomidine 10 ml infusion 10 min before extubation. Hemodynamic parameters in form of pulse rate, systolic and diastolic blood pressure, mean arterial pressure (MAP), oxygen saturation, and bispectral index (BIS) were noted. Extubation time, quality, and sedation were evaluated. Any side effects in form of postoperative nausea, vomiting, and bradycardia were noted. Results: There was significant attenuation of rise in heart rate, systolic, diastolic, and MAPs after 4 min of starting infusion between the three groups. At extubation, the values of hemodynamic parameters and BIS were significant between the three groups ( P < 0.001). While the quality of extubation improved and the sedation scores increased with the increase in the dose of dexmedetomidine, the incidence of bradycardia was more with dose of 1 μg/kg as compared to 0.75 μg/kg and 0.5 μg/kg. Conclusion: It was found that 0.75 μg/kg was the optimal dose for extubation as it facilitated smooth extubation and maintained hemodynamic stability in patients without causing undue sedation.