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The Study Of Pulse Wave Transmission And Cardiac Output

Posted on:2009-09-04Degree:MasterType:Thesis
Country:ChinaCandidate:Y C HeFull Text:PDF
GTID:2144360242994112Subject:Fluid Mechanics
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The pulse wave transmission and cardiac output is studied. Some linear and nonlinear models have been studied. And some models have been applied in the field of appliance of medical treatment. But the cardiac output measured by experiment is different from the cardiac output computed in the theory. These differences lead to some doubts: how many differences between the cardiac output of experiment and the methods, what is the extension of the theories, what are the factors that affect the cardiac output in the theories, and how to improve the linear and nonlinear models.In this dissertation, the linear and nonlinear models have been studied to acquire the characteristics and the factors which affect the cardiac output in the theories. According to physiological parameters of vassal wall in both the linear and nonlinear models, the cardiac output in the proximal end of the stretch tube can be obtained by the waveform of blood pressure in the distant end of the stretch tube. To obtain close value of the cardiac output, the different values of cardiac output should be computed in the conditions of different physiological parameters of vassal wall in the linear and nonlinear models. Therefore we must to study how the physiological parameters of vassal wall affect the cardiac output in the theories and then determine the value of different physiological parameters of vassal wall.The impact of numerical value of physiological parametersβ0,βl on the cardiac output have been studied in linear model. The results indicate that different value of physiological parametersβ0,βl can reflect different numerical values of cardiac output. The same as the nonlinear model, the impact of numerical value of different physiological parameters on the cardiac output have been studied in nonlinear model. Adjusting the numerical value of different physiological parameters and comparing numerical value of cardiac output with experiments, the close values of physiological parameters have been ascertained.The differences between the linear model and the nonlinear model by comparing their value of cardiac output with the experimental value of cardiac output are studied. The influencing factors of the differences are studied. Finally some significant conclusions are studied. These conclusions can help us to understand the models. All the studies ahead are the bases of the farther study and will promote to perfect the models. In future study, relationship between the pulse wave and the cardiac output will be improved.
Keywords/Search Tags:pulse wave transmission, cardiac output, linear model, nonlinear model, physiological parameter
PDF Full Text Request
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