• Qin Ye, Fangjun Wang, Hongchun Xu, Le Wu, and Xiaopei Gao.
• North Sichuan Medical College, No. 234, Fujiang Road, Shunqing District, Nanchong City, Sichuan Province, China.
• BMC Anesthesiol. 2021 Mar 1; 21 (1): 63.

BackgroundTo investigate the optimal dose of dexmedetomidine to maintain hemodynamic stability, prevent of cough and minimize postoperative pain for patients undergoing laparoscopic cholecystectomy.MethodsOne hundred twenty patients were randomly divided into D1, D2, D3 and NS groups, and dexmedetomidine 0.4, 0.6, 0.8μg/kg and normal saline were administrated respectively. Patients' heart rate, systolic blood pressure and diastolic blood pressure were measured at T1-T7. The incidence of cough was recorded. Other parameters were noted, the time of spontaneous respiratory recovery and extubation, visual analogue scale scores and dosage of tramadol.ResultsThe heart rate, systolic blood pressure and diastolic blood pressure of D2 and D3 groups has smaller fluctuations at T2-3 and T7 compared with NS and D1 groups (P < 0.05). The incidence of cough was lower in D2 and D3 groups than NS group (P < 0.05). The visual analogue scale scores and tramadol dosage of D2 and D3 groups were lower than NS group (P < 0.05). The time of spontaneous respiratory recovery and extubation in D3 group was longer than that in D1 and D2 groups (P < 0.05).ConclusionsIntravenous infusion of 0.6μg/kg dexmedetomidine before induction can maintain hemodynamic stability, decrease cough during emergence, relieve postoperative pain of patients undergoing laparoscopic cholecystectomy.Trial RegistrationChiCTR1900024801 , registered at the Chinese Clinical Trial Registry, principal investigator: Qin Ye, date of registration: July 28, 2019.

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