[Simplified method of radiocardiographic study of central hemodynamics]

The possibility of calculating the main parameters of the cardiac output and the pulmonary blood flow on the basis of a radiocardiogram alone, without performing radiometry of the administered dose of the isotope, and determination of the venous blood activity, is discussed. It is offered to use the relative indices of hemodynamics for this purpose: the indices expressing the values of the minute and stroke volumes, the circulating blood volume in the lungs expressed as percentage of the total circulating blood volume. A high degree of correlation between the absolute and relative indices of the central hemodynamics was established, the advantages and disadvantages of the simplied method of radiocardiography are revealed. The rationale of a parallel determination of the absolute and relative values of the hemodynamic parameters is emphasized since it permits a deeper insight into the hemodynamic shifts.