English
TitleAn Analysis of the External Work of the Left Ventricle and the Energy Consumption at Resistive Arterial Bed during the Optimally Controlled Hemodynamical State.
Subtitle
AuthorsHirohumi Hirayama*, Toshihiro Nishimura**, Yuzo Fukuyama*
Authors(kana)
Organization*Department of Public Health, Asahikawa Medical College, **Department of Electrical and Electronical Engineering Oita University
JournalCirculation Control
Volume15
Number4
Page586-593
Year/Month1994/
ArticleOriginal article
PublisherJapan Society of Circulation Control
Abstract「Abstract」The external work of the left ventricle and the energy consumption at resistive arterial bed have been calculated under the condition of the optimality in circulatory system that minimizes the external work of ventricle, potential energy and the rate of change in arterial blood flow. The energy consumed at resistive arterial bed and the external work of ventricle increased linearly with fluid resistance. At a given magnitude of the fluid resistance, they decreased with arterial compliance while they increased with aortic valvular resistance. The external work increased with the shortening of the ejection duration and with the increase of the stroke volume. The changes in the weighting coefficients relating to the external work and the potential energy did not affect the energy consumed at arterial bed nor the external work of ventricle. Thus the changes in the afterload impedance, in the ejection duration and in the stroke volume are more important on the energy consumption at arterial bed and the external work of ventricle than the relative ratio of the minimization of the external work and the potential energy of ventricle. Since present theoretical method enables us to calculate the energy consumption and the external work of ventricle without actual measurement, it is available for clinical application.
PracticeBasic medicine
Keywords

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