METHOD FOR DETERMINING STROKE VOLUME Russian patent published in 2017 - IPC A61B5/295 A61B5/53 

FIELD: medicine.

SUBSTANCE: in order to determine the stroke volume, two electrodes are applied to the body parts, resistance R between the electrodes is registered when the rheogram (RG) is made, blood hemoglobin Hb is measured. The stroke volume is determined by the calibration equation Q of the ratio of the resistance R to the limiting value R₀ between the electrodes RG with the function Q_0i of the normalized volume from the blood hemoglobin (Hb):

where R₀ is the limiting value of the resistance recorded at the upper and lower limits of the resistance values R_i of patients, normalised heart volumes Q_0i and stroke volume values of patients Q_i, with a different calibration for men and women, wherein i=1, 2, and

.

The function Q_0i Of the normalised volume is calibrated by the measured value of hemoglobin Hb in one patient with a known value of the stroke volume Q, according to which the parameters are calculated by successive approximation: the values of the limiting stroke volume Q₀ and the limiting blood hemoglobin Hb₀.

EFFECT: accuracy of measuring the stroke volume is increased by adapting the resistance along the limits of the range and calibrating the normalized volume by one measure of blood hemoglobin.

2 cl, 4 dwg, 1 tbl