The mobility analog for modeling the intra-arterial pressure wave parameters

Area of Science:

• Biomedical Engineering
• Physiology
• Electrical Engineering

Background:

• Dynamic pressure data from rat aortic arteries requires accurate modeling for physiological parameter identification.
• Previous mechanical models had limitations in representing mass elements and frames of reference.

Purpose of the Study:

• To construct and analyze a natural (mobility) mechanical circuit model for in vivo rat aortic artery dynamic pressure data.
• To identify physical and physiological parameters using an electrical analog approach.

Main Methods:

• Experimental data acquired using a Multifunction Pressure Generator (MPG), pressure probes, and high-speed video.
• Development of transfer functions in the s-domain relating input and intra-arterial pressure.
• Analysis of the equivalent electrical model using SPICE for steady-state (Bode plot) and transient responses.

Main Results:

• A compartmental model was developed that effectively explains the experimental observations.
• Physiological pressures were represented as electrical currents and volume flow rates as electrical voltages.
• The mobility model improved upon previous models by referencing the mass element to a single frame.

Conclusions:

• The developed mobility model provides a robust framework for analyzing rat aortic artery dynamics.
• The electrical analog approach simplifies the analysis of complex mechanical systems.
• This model offers enhanced accuracy and a clearer representation of physical properties compared to prior models.