The invention refers to an apparatus that determines the abnormal electrical potential points which appear in the ventricular myocardium, particularly the left ventricle, which are capable of generating arrhythmias with a serious impact. The apparatus may assist the physician in objectively identifying, in real time, of the points which require ablating. The apparatus to determine the points of abnormal electrical potential from the ventricular myocardium contains an amplification and analogue filtering module, an analogue to digital signal converter, a hardware device which contains a microchip for digital processing, by means of a software, of signals received from an EKG and a catheter, with a display for the visualization of the signals received from the EKG and the catheter, as well as the abnormal electrical potentials found in the ventricular myocardium, identified via the software. The software analyzes the received signal from the catheter, referring to the amplitude, duration and synchronization with the QRS complex of the signal received from the EKG, as well as the degree of spectral fragmentation.
