Time-variant left ventricle models for intracardiac impedance analysis

Area of Science:

• Biomedical Engineering
• Cardiovascular Physiology
• Medical Simulation

Background:

• Cardiovascular diseases are a major global health concern, necessitating continuous hemodynamic monitoring in critically ill patients.
• Current methods for monitoring left ventricular volume (LVV) are limited by manual intervention or inaccuracy.
• Intracardiac impedance measurements offer a promising avenue for continuous cardiac function assessment.

Purpose of the Study:

• To develop novel, freely available cardiac-mechanical left ventricular models.
• To incorporate cardiac motion throughout the entire cardiac cycle.
• To provide a basis for developing accurate LVV estimation algorithms.

Main Methods:

• Development of four distinct cardiac-mechanical left ventricular models with varying complexities and geometries.
• Simulation of cardiac motion across a complete cardiac cycle for each model.
• Analysis of intracardiac impedance measurements and their correlation with LVV.

Main Results:

• All developed models demonstrated high resemblance in measured admittances.
• A strong, non-linear correlation was found between impedance measurements and LVV.
• The study highlighted how different ventricular geometries influence impedance readings.

Conclusions:

• The developed cardiac-mechanical models provide a valuable tool for simulating cardiac dynamics.
• These models are crucial for advancing the development of LVV estimation algorithms using impedance monitoring.
• The findings support the potential of intracardiac impedance for continuous cardiovascular monitoring.