Narcotrend and bispectral in monitoring stress reactions to tracheal intubation in gynecological patients during general anesthesia induction period

Objective To compare the narcotrend (NT) and bispectral (BIS) in monitoring stress reactions to tracheal intubation in gynecological patients during the general anesthesia induction period. Methods Forty ASAⅠ-Ⅱgynecological patients underwent operation under general anesthesia. Their BIS and NT indexes, mean arterial pressure (MAP) and heart rate (HR) were recorded before anesthesia induction, at falling in sleep and tracheal intubation, and 1 min after tracheal intubation, respectively. Results The BIS and NT indexes were significantly lower at falling in sleep and tracheal intubation and 1 min after tracheal intubation than before tracheal induction, and significantly higher after tracheal intubation than at falling in sleep (P< 0.01). The MAP and HR were higher after tracheal intubation than before tracheal induction (P< 0.01). No significant difference was found in BIS index at tracheal intubation and 1 min after tracheal intubation. However, the NT index was significantly higher 1 min after tracheal intubation than at tracheal intubation (P< 0.05). The BIS and NT indexes reflecting the stress reactions to tracheal intubation were linearly correlated(r²=0.916, P< 0.05). Conclusion BIS and NT indexes can show the stress reactions to tracheal intubation during the general anesthesia induction period and are positively correlated.