Title :
Parameter optimization method for less-invasive and beat-by-beat estimation of Emax
Author :
Yoshizawa, Makoto ; Iemura, Shozo ; Abe, Ken-ichi ; Takeda, Hiroshi ; Kakinuma, Yoshito ; Akiho, Hiroshi ; Yambe, Tomoyuki ; Nitta, Shin-ichi
Author_Institution :
Dept. of Electr. Eng., Tohoku Univ., Sendai, Japan
fDate :
31 Oct-3 Nov 1996
Abstract :
A new method for less-invasive and beat-by-beat estimation of the maximum ventricular elastance (Emax) has been proposed. The method (parameter optimization method) needs only two measurements: aortic pressure and flow. In the estimation process, least squares method was applied to an identity equation based on a simple electrical circuit model of the systemic circulation. In the model, the left ventricular elastance was approximated by a linear time function. In vivo experiments using an adult goat yielded small estimation errors of aortic flow less than about 1.5 L/min. Stability of estimation was also good
Keywords :
biomechanics; blood flow measurement; blood pressure measurement; cardiology; elasticity; optimisation; parameter estimation; physiological models; Emax; adult goat; aortic flow; estimation stability; in vivo experiments; least squares method; left ventricular elastance; linear time function; maximum ventricular elastance; parameter optimization method; systemic circulation; Circuits; Equations; Estimation error; Fluid flow measurement; In vivo; Least squares approximation; Least squares methods; Linear approximation; Optimization methods; Pressure measurement;
Conference_Titel :
Engineering in Medicine and Biology Society, 1996. Bridging Disciplines for Biomedicine. Proceedings of the 18th Annual International Conference of the IEEE
Conference_Location :
Amsterdam
Print_ISBN :
0-7803-3811-1
DOI :
10.1109/IEMBS.1996.652834
