[Spectrum analysis of ECG of patients with terminal conditions]

Spectral ECG analysis has been performed in 68 patients (126 tests) to assess predictive value of the amplitude-frequency analysis for the prognosis of severity and potential outcome of the disease. ECG was registered in 3 orthogenic leads according to the method of Frank. Spectral analysis was performed using spectrobiograph. Two time periods of the cardiac cycle--the QRS complex and the T wave have been analysed. The results have demonstrated characteristic changes in the amplitude values of high and low-frequency constituents of the ECG spectrum signal in the group of patients under study. The changes observed help elucidate the impaired functional myocardial activity and predict the natural history of the disease.