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[Diagnostic significance of specific features of blood flow in the vicinity of stenosis. Model experiments].

Axisymmetric stenoses made of teflon were inserted into PCV tubes, 0.39-0.4 cm in diameter. There was a 28-93% reduction in the area of vessel lumen. The pulsatile flow of water-glycerol mixture containing talcum particles was maintained by an artificial circulatory device. The Doppler ultrasound system was used to measure flow characteristics. The background (remote from the stenosis) values were studied by dispersion analysis. The dependence of the values in the area of stenosis upon the degrees of stenosis was described by the parabolic function. The combination of the function with an upper 95% background limit shows that the method records luminal changes nearly by 20%.