[Use of the method of thoracic electric bioimpedance in medical evaluation of central hemodynamics in man].

Stroke and minute cardiac volumes were simultaneously determined at rest in seven healthy male subjects aged 28-48 and 13 patients with various forms of partial insufficiency of the central hemodynamics with the use of thoracic electrical bioimpedance and Doppler echocardiography. The bio-impedance method employed IBM-compatible NCCOM3-R7. The Doppler echocardiograms were registered using TOSHIBA-50. Correlative analysis of the records was performed on 4 parameters, i.e. minute volume (MV), stroke volume (SV), cardiac index (CI), and stroke index (SI). In the group with partial insufficiency the correlation coefficient amounted to 0.89, 0.92, 0.81 and 0.92 for MV, SV, CI and SI, respectively. In healthy subjects the correlation coefficient made up 0.91, 0.90, 0.89 and 0.91 for MV, SV, CI and SI, respectively. In the combined group the correlation coefficient averaged 0.88, 0.92, 0.83 and 0.92 for MV, SV, CI and SI, respectively. These results allow to rate high the accuracy of thoracic electrical bio-impedance and recommend it for the program of medical selection and annual health check of occupational groups systematically exposed to extreme impacts.