The case for the reservoir-wave approach.

Area of Science:

• Cardiovascular Physiology
• Hemodynamics
• Biomedical Engineering

Background:

• Conventional hemodynamic analysis faces limitations, including paradoxical wave interpretations.
• The Reservoir-Wave Approach offers a new time-domain perspective on arterial hemodynamics.
• Understanding wave propagation and reflection is crucial for diagnosing cardiovascular conditions.

Purpose of the Study:

• To introduce and validate the Reservoir-Wave Approach for analyzing arterial hemodynamics.
• To investigate aortic wave propagation and reflection patterns in canine models.
• To differentiate between reservoir and wave components of blood flow and pressure.

Main Methods:

• Decomposition of measured pressure and flow into reservoir and excess (wave) components.
• Application of wave intensity analysis to the excess components.
• Experimental observation in canine circulation.

Main Results:

• A novel pattern of aortic wave propagation and reflection was identified in dogs.
• Positive wave reflection originates from the femoral circulation; negative reflection occurs below the diaphragm.
• Vasodilatation enhances negative reflection, while vasoconstriction diminishes it, challenging conventional theories.

Conclusions:

• The Reservoir-Wave Approach provides a physiologically plausible explanation for wave propagation and reflection.
• Conventional hemodynamic interpretations, such as the impedance minimum, may be attributed to the reservoir component.
• Further clinical studies are warranted to explore the diagnostic and therapeutic potential of this approach.