Apparatus for determining the cerebral state of a patient with fast response

It is related with the method and system for checking the state of a patient's cerebrum. This method / equipment has found out the use to the thing of a patient's anesthesia to do for a depth check. With the form of 1 enforcement, the entropy of a patient's EEG signal data is determined as directions of the state of a cerebrum. The quantity of the power spectrum of a frequency domain is acquired from a patient's EMG signal data. The quantity of a power spectrum can be updated more frequently than EEG entropy for the high frequency. It is combined, and directions of EEG entropy and directions of an EMG power spectrum turn into compound directions, and give the quick directions about the change in the state of a patient's cerebrum. With the form of another enforcement, the frequency range with which the entropy of the living body potential signal from a patient is determined is broadband-ized so that both EEG signal data and EMG signal data may be included, and entropy is determined are used as directions of the state a patient's cerebrum.