[Necrosis-Q in the mapping ECG]

In this study 57 test persons 15 healthy ones, 42 patients with myocardial infarction with disturbances of the wall excursion) were examined by means of the mapping ECG, the classical ECG and the echocardiography. Considering the healthy test persons the normal values of the Q-deflections were established for every individual lead of the mapping ECG and of this the borderline values for the necrosis-Q (Q less than Q(m-1 s] were derived. The topographic coordination was performed with the help of a computer-aided picture of the thoracic surface. The determination of the localization of an echocardiographically proved disturbance of the wall excursion by means of the mapping ECG on the basis of the borderline values stated for the Q-deflections was carried out with an efficiency of 0.810 and by means of the classical ECG with an efficiency of 0.690. The information of the Q-deflections in the mapping ECG about the presence of an echocardiographically provable disturbance of the wall excursion is possible with an efficiency of 0.833. For the diagnosis of an infarction all infarction-typical parameters should always be used simultaneously. The clinical significance of the diagnostics of myocardial infarction by means of the mapping ECG lies in the exact localisation, the gradual valuation of the size of the infarction, in the recognition of changed potential distribution pattern as sign of the activity of a coronary heart disease with the complication of a myocardial infarction and the establishment of smaller as well as nontransmural myocardial infarctions with non-invasive methods.