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Fitting a Cardiac Cycle of Left Ventricular Blood Pressure Curve
Asia-Pacific Journal of Computer Science and Technology
Volume 1, Issue 1, March 2019, Pages: 8-14
Received: Dec. 10, 2018; Accepted: Jan. 16, 2019; Published: Feb. 20, 2019
Authors
Sun Bing, Tianjin Metrology Supervision and Testing Science Research Institute, Tianjin, China
Tian Feng, University Office, Information College, Hebei University of Technology, Tianjin, China
Liu Li, University Office, Information College, Hebei University of Technology, Tianjin, China
Zhang Yan, University Office, Information College, Hebei University of Technology, Tianjin, China
Qi Jingai, University Office, Information College, Hebei University of Technology, Tianjin, China
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Abstract
The left ventricular blood pressure curve of one cardiac cycle of an actual heart is known, and its blood pressure curve is fitted by the fuzzy control of three elements. According to the characteristics at the time points on the curve of blood pressure, after divided into five sections, it could be fitted. When using a three-element-controlled fuzzy fit, the curve is expressed as y(x)=c2x2+c1x+c0, where ci is the constant to be solved, and because of the three unknown c2, c1, c0, there must be 3 constraints . If we know the three coordinate points on the distribution curve and slope m1 on the initial segment, When y (x)=c2x2+c1x+c0 is expressed in a matrix, then the inverse of it can be obtained. Thus, we can get the expression y=f(x)=f(x1, y1, x2, y2, m1). In the Maple software environment, entering the expression f(x1, y1, x2, y2, m1) and x1, x2, y1, y2, m1, then could get the y = f(x) expressions and plot their graphs. The fitting results of y= f(X) expressions for the 5 periods are shown in table 3 and after observed fitting effect of the three control elements, the visual effect on the curve is still well as possible. The maximum and the minimum blood pressure in the left ventricle are 120 and 1.5 mm Hg, respectively, and the resulting expression y = f(x) for each segment can be put into practical use for electrostatic excitation of aorta electrostatic pumps.
Keywords
Blood Pressure Curve of Heart, Three-Element Controlled Fuzzy Fit, Electrostatic Blood Pump and Valve, Inversion, Two Order Polynomial
Sun Bing, Tian Feng, Liu Li, Zhang Yan, Qi Jingai, Fitting a Cardiac Cycle of Left Ventricular Blood Pressure Curve, Asia-Pacific Journal of Computer Science and Technology. Vol. 1, No. 1, 2019, pp. 8-14.