Interaction between the rigt heart ventricle and its arterial load: a quantitative solution

Area of Science:

• Cardiovascular physiology
• Biomedical engineering

Background:

• Ventricular performance is crucial for cardiac function.
• Previous work established a relationship between pressure (P), volume (V), and time (t) for ventricular performance (P = function(V,t)).
• Vascular load, defined by arterial input impedance (Z(f)), influences ventricular output.

Purpose of the Study:

• To describe a method for calculating ventricular flow and pressure.
• To integrate independent models of ventricular function and vascular load.
• To validate the calculation method against experimental data.

Main Methods:

• Developed an empirical equation to approximate the experimentally mapped three-dimensional PVt surface.
• Utilized inverse Fourier transformation to convert arterial input impedance (Z(f)) from the frequency to the time domain.
• Calculated ventricular flow and pressure by combining the PVt surface model and the time-domain representation of vascular load.

Main Results:

• Successfully calculated ventricular flow and pressure curves.
• Achieved an excellent fit between calculated and observed curves for right ventricular contractions in isolated cat hearts.
• Demonstrated the utility of the PVt surface and arterial impedance in predicting ventricular performance.

Conclusions:

• The proposed method effectively calculates ventricular pressure and flow by integrating ventricular and vascular load characteristics.
• This approach provides a valuable tool for understanding and predicting cardiac mechanical function.
• The findings support the use of PVt surfaces and impedance analysis in cardiovascular research.