Objective To compare the prediction probability (Pk) of loss of consciousness (LOC) for the four EEG nonlinear indexes-correlation dimension ( D2), approximate entropy (ApEn) complexity (Cx) and bispectral index (BIS) and their relative accuracy.

• 目的通过比较脑电非线性参数关联维数(D2)、近似熵(ApEn)、复杂度(Cx)和脑电双频指数(BIS)对异丙酚靶控输注(TCI)镇静时意识消失的预测概率(Pk),比较各脑电参数预测意识消失的准确性。