Effect of artificial lung compliance on right ventricular load

Area of Science:

• Biomedical Engineering
• Cardiovascular Physiology
• Respiratory Medicine

Background:

• Artificial lungs are potential alternatives for patients with respiratory failure.
• Pulmonary replacement devices must not significantly increase right ventricular afterload.
• Understanding the hemodynamic impact of artificial lungs is crucial for clinical application.

Purpose of the Study:

• To characterize cardiac load and right ventricular function with a prototype artificial lung.
• To evaluate the effect of device compliance on pulmonary impedance and hemodynamics.

Main Methods:

• Implantation of a prototype artificial lung in 13 adult sheep (7 noncompliant, 6 with compliance chamber).
• Measurement of pulmonary impedance and analysis of pulse wave reflections.
• Assessment of right ventricular function before and after device implantation.

Main Results:

• The noncompliant artificial lung significantly increased first harmonic impedance and pulse wave reflections, altering right ventricular function.
• The modified device with a compliance chamber reduced first harmonic impedance and pulse wave reflections.
• The compliant artificial lung normalized right ventricular function.

Conclusions:

• A noncompliant artificial lung increases pulmonary impedance and negatively impacts right ventricular function.
• Incorporating a compliance chamber into artificial lung design mitigates adverse hemodynamic effects.
• Compliance is essential for artificial lungs to function as safe pulmonary replacements.