[Ventricular activation time maps in health and after myocardial infarction registered in spherical system].

The present paper concerns the results of the examinations on Ventricular Activation Time distribution. The registrations were performed using the 30-electrode network connected to from the diamentoid scheme giving the sphere system, in the centre of which the heart is located. The potentials for one ECG cycle were measured at every electrode. The created computer program changed the spheric recordings into the plane development which resulted in the 30 ECG recordings located under the particular electrode. Using these values the activation time was determined for every registration point. On that basis, the isochronic map for the patient is created. The ECG tracings were recorded in 48 healthy subjects, treated as the control group, and in the 96 patients with the previous myocardial infarction varying in location and extension. The obtained maps were compared both within and between the examined groups. For the normal subjects, the isochrone distributions are similar. The lines are arranged according to the physiological activity propagation through the myocardium. The quite different distribution was observed on the isochrone maps obtained from the patients with myocardial infarction, as compared with the maps from the control group. On the basis of the specific isochrone distribution, the exact location and can be identified. The patterns for the given location of the myocardial infarction are significant similarity--the possible differences concern only the foci extensions.