Computer simulation of haemodynamic parameters changes with left ventricle assist device and mechanical ventilation

Area of Science:

• Biomedical Engineering
• Cardiovascular Physiology
• Computational Medicine

Background:

• Left Ventricular Assist Device (LVAD) therapy is crucial for heart failure management.
• LVADs aim to improve cardiac output and systemic pressure while reducing left atrial pressure.
• The interaction between LVADs and mechanical ventilation requires further hemodynamic assessment.

Purpose of the Study:

• To evaluate the influence of mechanical ventilation on hemodynamic parameters during LVAD support.
• To assess how pathological conditions affect these interactions.
• To understand the implications for LVAD effectiveness.

Main Methods:

• A computer simulation model of the heart and circulatory system was employed.
• The model incorporated lumped parameter RLC elements and a variable elastance model for ventricular function.
• A Left Ventricular Assist Device was simulated between the left atrium and aorta, with adjustable cardiac contractility and arterial resistance.

Main Results:

• Positive thoracic pressure from mechanical ventilation significantly alters left atrial and pulmonary arterial pressures.
• Systemic arterial resistance changes have a notable impact, particularly when LVAD and ventilation are combined.
• Cardiac output, systemic arterial, and right atrial pressures showed less sensitivity to thoracic pressure changes in simulated heart pathologies.

Conclusions:

• Mechanical ventilation critically influences hemodynamic assessment in LVAD patients.
• Simulations highlight the importance of considering ventilatory support and systemic resistance in LVAD therapy.
• These findings are vital for optimizing LVAD performance and patient outcomes.