A system for representation and analysis of pressure variables in a patient including a plurality of pressure sensors; a signal processor connected to process signals emitted by the sensors, wherein the process comprises a multiplicity of inputs for receiving analog signals from the sensors, wherein each input is connected to a sampling circuit providing a digital signal used by a calculator for performing processing steps comprising: resampling displayed or recorded signals, analyzing the frequency of sampled signals in relation to a range of target frequencies recorded in a memory, for the display and recording of temporal variations of the signals corresponding to slow waves of the signals, and determination of temporal shifts between the slow waves corresponding to two distinct inputs; and a display that shows variations in the signals.