Spectral analysis of the ECG in patients during terminal state and in the postresuscitation period.

The use of amplitude end frequency analysis of the ECG in the terminal state end postresuscitation period is presented. One hundred one studies were carried out on 64 patients in critical condition. ECG recordings were done in 3 orthogonal leads (Frank's method) with a standard amplification of 1 mV. On each lead 5-7 cardiac cycles were recorded with analysis of 2 components of the ECG: QRS complex and T wave. In order to determine the feasibility of employing such a method for forecasting pathological states, an additional 68 patients, who had been subjected to studies, were taken. In the hope of matching patterns of ECG spectral signals with indices of central haemodynamics, a group of 67 patients, who were subjected to 138 studies during the postresuscitation period, was taken. The parameters for central haemodynamics were measured by impedance cardiography with automatic analysis of the results on the EBM EC-1022. The studies carried out show that the spectral analysis of the orthogonal leads (according to Frank) brought a series of changes in the amplitude-frequency characteristics of the ECG signal in patients in the terminal state and in the postresuscitation period. The noted changes facilitate the unveiling of the disorders of the functional activity of the myocardium and the forecasting of the development of the pathological condition.