| Abstract: | Conclusions 1. Parameters of valid signal in oscillometric methods of measurement of arterial blood pressure depend on values of diastolic
and pulse arterial blood pressure, heart rate, type of elasticity and collapse of the humeral artery, volume of the artery,
volume of the blood pressure cuff, and the ratio of the duration of arterial pressure oscillations to valid signal period.
The peak amplitude of the valid signal varies over a range from 0.31 to 7.34 mm Hg, and heart rate varies from 0.66 to 3.33
Hz. The characteristic point for determining systolic arterial blood pressure is the maximum of the envelope of the “negative”
part of oscillometric signals, and for diastolic arterial blood pressure is the maximum rate of the decrease of the envelope
of the “positive” part of oscillometric signals. The correlation coefficient between experimental signal and theoretical calculations
was found to be 0.84.
2. Two types of interferences, related to breathing and movement of patient, have the largest affect on the results of arterial
blood pressure measurements by the oscillometric method.
3. An interference-rejecting algorithm was developed for measuring systolic and diastolic arterial blood pressure. The algorithm
was implemented in prototype models of the SA-02 and SA-03 automated sphygmomanometers.
Clinical trial of the SA-02 automated sphygmomanometer revealed overall error in determination of systolic and diastolic arterial
blood pressure in a sample of 144 patients to beS=6.6 mm Hg for systolic arterial blood pressure andS=6.4 mm Hg for diastolic arterial blood pressure. The results of the trial meet the requirements of the United States standard.
Scientific Research Institute for Medical Instrument Engineering, Moscow. Translated from Meditsinskaya Tekhnika, No. 3, pp.
19–28, May–June, 1993. |
