Active and Passive Changes in the Characteristic Impedance of the Proximal Aorta
It has been shown earlier that volume expansion causes a change in the activity of the aortic smooth muscle (Dujardin et al., 1980a). After increasing the circulating blood volume by 30%, the aortic diameter D at a given pressure P (e.g. 125 kdyne/cm2) was increased by 6.6% while dP/dD was decreased by 14.6%. Using formula (1), which relates the characteristic impedance of the proximal aorta (ZC) to the aortic P-D relationship, a decrease in ZC at a given pressure would be predicted (ρ is the density of the blood).
KeywordsMorphine Dextran Dium Macrodex
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- Kenner, T., 1979, Physical and mathematical modeling in cardiovascular systems, in: “Quantitative cardiovascular studies”, N.H.C. Hwang, D.R. Gross and D.J. Patel, ed., University Park Press, Baltimore.Google Scholar
- Stone, D.N., Dujardin, J-P.L., 1979, The characteristic impedance of the proximal aorta studied in the time and frequency domain, Fed. Proc., 38: 1035.Google Scholar