The invention relates to a method (400) performed by an anesthetizing monitoring unit (110) configured to generating an improved evoked electromyography response signal (∑), the method comprising transmitting (515) a stimuli signal (S) using an output port (112) of the anesthetizing monitoring unit (110), receiving (525) an evoked electromyography,EMG, response signal (S), having a duration (T), in response to the transmitted stimuli signal (S) using an input port (111) of the anesthetizing monitoring unit (110), estimating (535) a periodic noise waveform (S), having the duration (T), by using temporal segments of a noise signal (S), generating (545) the improved response signal (∑) by subtracting the noise waveform from the response signal (S). The invention further relates to an anesthetizing monitoring unit (110) and an anesthetizing monitoring system (100).
