Input impedance at high and low frequencies reveals effects of pulse wave propagation and reflection

Input impedance (Zin) describes the load seen by the ventricle. At low frequencies, Zin degenerates into the windkessel impedance, Zw, which is related to total arterial compliance and peripheral resistance, At high frequencies, the arterial system behaves like an infinitely long tube. Thus at high frequencies, Zin degenerates into characteristic impedance, Zo, which is related to local aortic compliance and radius. These two limits, where wavelength is very long, and reflection is very small, can be used to understand the role of pulse wave propagation and reflection.

Input impedance at high and low frequencies reveals effects of pulse wave propagation and reflection Conference Paper