A model of mechanical interactions between heart and lungs

Area of Science:

• Physiology
• Biomedical Engineering
• Computational Biology

Background:

• Understanding cardiorespiratory mechanical interactions is crucial for diagnosing and treating various medical conditions.
• Existing models often focus on either the respiratory or cardiovascular system independently, limiting the study of their interplay.

Purpose of the Study:

• To develop and validate a comprehensive mathematical model that integrates both ventilatory neuromuscular and cardiovascular systems.
• To investigate the mechanical interactions between the heart, lungs, and thorax using a coupled computational model.

Main Methods:

• Adapted a Liénard oscillator-based respiratory model to simulate respiratory centers, muscles, and rib cage mechanics.
• Integrated this respiratory model with a minimal hemodynamic system model of the cardiovascular system (Smith et al.).
• Coupled the models using pleural pressure from the respiratory system and intrathoracic blood volume from the cardiovascular system.

Main Results:

• The simulation results closely align with experimental data.
• The model's outputs are consistent with previously published literature findings.
• The simulations highlight the presence and significance of mechanical cardiorespiratory interactions.

Conclusions:

• The proposed integrated mathematical model effectively captures the mechanical cardiorespiratory interactions.
• This model serves as a valuable tool for further research into cardiorespiratory physiology and pathology.
• The findings underscore the importance of considering coupled cardiorespiratory mechanics in physiological studies.