Application of Narcotrend for aged patients undergoing flexible fiberoptic bronchoscopy with laryngeal mask airway anesthesia

Abstract

Objective To observe the feasibility of Narcotrend for aged patients undergoing flexible fiberoptic bronchoscopy with laryngeal mask airway anesthesia and to explore the optimal Narcotrend index (NTI) in the operation.Methods Sixty aged patients were equally randomized into three groups:(Ⅰ)NTI(79-65),(Ⅱ)NTI(64-37) and (Ⅲ)NTI(＜37).Integral dose of propofol after inserting LMA,awakening and orientation recovery time and adverse effects were recorded.NTI,systolic blood pressure(SBP),diastolic blood pressure(DBP),mean arterial pressure(MAP),blood oxygen saturation(SpO2),heart rate(HR) and end-tidal carbon dioxide partial pressure(PETCO2) were compared in three groups at different time points.Results The doses of propofol were(2.16± 0.31),(2.78±0.37),(3.15±0.29) mg/kg,respectively,in three groups.The successful rate of fiberoptic bronchoscopy insertion was 85％,100％ and 100％,respectively.SBP,DBP,MAP and HR had significant differences among groups(P＜0.05) and hypotension and bradycardia occurred in two patients in Ⅲ group.Awakening and orientation recovery time were longer in Ⅲ group than the other two groups (P＜0.05).Conclusions Narcotrend may monitor the anesthesia sedative depth,direct the regulation of propofol dose,and the optimal NTI for the aged patients undergoing fiberoptic bronchoscopy with laryngeal mask airway anesthesia is 64-37. Key words: Narcotrend index; Laryngeal mask; Elderly; Flexible fiberoptic bronchoscopy