The Physical Conditions of Different Organs Are Reflected Specifically in the Pressure Pulse Spectrum of the Peripheral Artery

Abstract

We try to solve the “hemodynamic inverse problem” of the internal organs in terms of the peripheral pressure pulse spectrum analysis. Side-branch organs are approximated as resonators with own natural frequencies. They are depicted not as ordinary reflection sites but as antennas that receive energy from the main artery and undergo forced oscillations with selective frequencies. Every organ also reacts back to the main artery as a secondary “small heart source” that generated harmonic forces with maximum amplitude near its own natural frequency. The whole arterial system is in a steady distributed oscillatory state that is the superposition result of encountering the forces generated by the heart and many internal organs. A “frequency matching” theory of the organ and the main artery is proposed. The Fourier components of the pressure pulse in the arterial system are related to the matching conditions of different organs. In vivo studies in kidney and spleen of rats are provided.