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[Usefulness of amplitude as a rheographic-cardiographic parameter for evaluation of degree of heart failure].

Impedance rheographic-cardiography has been performed in 40 patients with chronic congestive heart failure. At the same time, polycardiographic data have been recorded and used for the correlative analysis. A curve dZ/dt has been analysed and "S", "X", "A", "O" waves amplitudes together with A/S and X/S ratios have been calculated, depending on the degree of heart failure. It was found, that rheographic-cardiography may be valuable technique for the assessment of the degree of heart failure. Curve dZ/dt in patients with more advanced heart failure is of hypodynamic character (decrease in "S", "X", and "A" waves amplitude with an increase in "O" wave amplitude), being similar to sinusoidal curve. The most valuable rheographic-cardiograph parameters enabling the assessment of heart failure are: "S" and "O" waves amplitudes, and A/S and X/S ratios. Correlative analysis has also shown several important relationships between rheographic-cardiographic and polycardiographic parameters, which may facilitate the assessment of heart failure.