The filter properties of the arterial beds of organs in rats

Abstract

The frequency properties of arterial beds in organs were studied by temporarily ligating the renal, the gastric, the splenic or the superior mesenteric arteries of rats. Blood-pressure waves of the tail arteries were recorded before and during the ligations, and were analysed by Fourier's transformation. Their frequency spectra have been found to change profiles following specific patterns with the ligations of different arteries. The results were significant with regard to the frequency selectivities of the organic arterial beds. Such frequency properties can be clearly explained when the circulation system is viewed as an electrical circuit network in which the organic arterial beds work as filters.

Low Power 0.15 THz Wave Can Obviously Influence Human Blood Cycle Dynamics

“…Actually, the signal contains extremely complex physiological information. A large numbers of researches indicate that the pulse wave contains the physiological information of heart and blood vessel and many other organs can significantly impact the form of pulse wave [24][25][26].Professor Wang WK proved that the pulse wave is the resonance result of heart beat and other organs by blood fluid dynamics [27][28][29]. The different harmonic components reflect the activity of different organs.…”

“…According to Professor Wang WK, spectrum distribution of the pulse wave shows the status of different organs and the pulse wave is the resonance of heart beat harmonic [27][28][29]. The traditional pulse wave analysis is based on an assumption that the wave is a continuous periodic signal [26,[30][31].…”

Assessment of Parasympathetic Control of Blood Vessel by Pulsation Spectrum and Comparison With Spectral Method of Rr Intervals

“…[33][34][35][36] The pulsatile nature of the arterial pressure and flow combined with the elastic properties of vessel, the viscosity and inertial nature of blood, and the variable compliance and geometry of vascular system introduce phase relationships between the arterial pressure and flow.…”

“…In most models, the blood vessels are treated as a string of identical units chained together, so that pressure and flow waves pass through each one of them in sequence. The mathematical expression of such an arrangement is called a transmission-line model [33][34]. Taylor designed an electrical network for a mathematical transmission-line model to simulate the effects of viscoelasticity in the walls of blood vessels.…”

“…[33][34][35][36][37] The Fourier components of the pulse are related to the resonant condition of blood pressure distribution and tissue. The physical conditions of the internal organs or tissues will influence their resonant status and the distributions of blood pressure.…”