A method of an EKG signal processing performed by means of an apparatus, which contains a block of analogue amplifiers, to an output of which an input of a block of an analogue signal to digital signal converters is connected, where the individual analogue amplifiers of the block of the analogue amplifiers are connected with their inputs to the outputs of the individual channels of the EKG signal and with their outputs to the inputs of the individual analogue signal to digital signal converters of the block of the analogue signal to digital signal converters, wherein the chain of sensors, block of the analogue amplifiers and the block of the analogue signal to digital signal converters has a dynamic range above 100 dB within the whole transmission band, to the outputs of the individual analogue signal to digital signal converters of the block of the analogue signal to digital signal converters a storage unit is connected, to the output of which a detector of R m of R wave of QRS complex is connected, wherein to the output of the detector of R m of R wave of QRS complex a unit for calculating the envelopes and averaging is connected via a band pass filter, to the output of the unit for calculating the envelopes and averaging at least one indicating unit is connected, wherein by means of the apparatus - a frequency range above the frequency of 250 Hz is selected on the EKG signal in measuring channels, - from this component of the EKG signal in the selected frequency range amplitude envelopes or power envelopes of the EKG signal are calculated, wherein the amplitude envelopes or power envelopes of the EKG signal are calculated using Hilbert transformation, or the amplitude envelopes of the EKG signal are calculated by filtering the EKG signal, converting the signal obtained this way to an absolute value and smoothing of it, or the power envelopes of the EKG signal are calculated by filtering the EKG signal, raising the EKG signal to the power of two and smoothing of it, - these amplitude or power envelopes of the EKG signal are averaged for individual channels with respect to R m of R wave position to increase signal-to-noise ratio, R m being maximum of R wave, characterized in that - thereafter the envelopes of the EKG signal from the individual channels obtained in this way are mutually compared on the time axis. - a frequency range above the frequency of 250 Hz is selected on the EKG signal in measuring channels, - from this component of the EKG signal in the selected frequency range amplitude envelopes or power envelopes of the EKG signal are calculated, wherein the amplitude envelopes or power envelopes of the EKG signal are calculated using Hilbert transformation, or the amplitude envelopes of the EKG signal are calculated by filtering the EKG signal, converting the signal obtained this way to an absolute value and smoothing of it, or the power envelopes of the EKG signal are calculated by filtering the EKG signal, raising the EKG signal to the power of two and smoothing of it, - these amplitude or power envelopes of the EKG signal are averaged for individual channels with respect to R m of R wave position to increase signal-to-noise ratio, R m being maximum of R wave, characterized in that - thereafter the envelopes of the EKG signal from the individual channels obtained in this way are mutually compared on the time axis.