Article Impact Level: HIGH Data Quality: STRONG Summary of Annals of Biomedical Engineering https://doi.org/10.1007/s10439-024-03585-y Dr. Nina Langer et al.
Points
- Heart failure with preserved ejection fraction (HFpEF) accounts for half of all heart failure cases, often presenting with smaller left ventricular cavities.
- A simulated HeartMate 3 in a left atrial to aortic (LA-Ao) configuration reduced resting mean left atrial pressure from 15 to 11 mmHg with 1 L/min support.
- During exercise simulation, 6 L/min of HeartMate 3 support effectively lowered mean left atrial pressure from 29 to 16 mmHg.
- Anatomical assessment revealed the HeartMate 3 fit 6 of 14 HFpEF patients without impingement, while causing 4–14 mm impingement in others.
- The HeartMate 3 in an LA-Ao configuration shows significant promise for left atrial unloading in a select group of HFpEF patients, underscoring the necessity for thorough pre-surgical anatomical evaluation.
Summary
This study explored the potential of the HeartMate 3 left ventricular assist device in a left atrial to aortic (LA-Ao) configuration for patients with heart failure with preserved ejection fraction (HFpEF). Given that HFpEF constitutes 50% of heart failure cases and often involves smaller left ventricular cavities, this approach presents a novel strategy for hemodynamic support. The research aimed to evaluate both the anatomical feasibility and the left atrial unloading capacity of the HeartMate 3 in a simulated HFpEF model.
Using a cardiovascular simulator, the HeartMate 3 in an LA-Ao configuration was modeled across seven distinct pump flow rates, assessing hemodynamic parameters during both resting and exercise conditions. Anatomical compatibility was further investigated using computed tomography scans from 14 HFpEF patients (NYHA Class II-III) and 6 heart failure with reduced ejection fraction patients, with virtual fit assessments performed for the HFpEF models.
Results indicated that at rest, even with minimal HeartMate 3 support (1 L/min), mean left atrial pressure was significantly reduced from 15 to 11 mmHg. During simulated exercise, 6 L/min of support lowered mean left atrial pressure from 29 to 16 mmHg. Anatomically, the HeartMate 3 achieved successful placement in 6 of the 14 HFpEF patients without impingement. However, the device caused 4–14 mm impingement in the remaining patients.
These findings suggest that the HeartMate 3 in an LA-Ao configuration holds promise for effectively unloading the left atrium and mitigating pulmonary congestion in a carefully selected subset of HFpEF patients. This highlights the critical importance of pre-surgical anatomical assessment to address size-related constraints for optimal patient outcomes.
Link to the article: https://link.springer.com/article/10.1007/s10439-024-03585-y
References
Langer, N., Stephens, A. F., Šeman, M., McGiffin, D., Kaye, D. M., & Gregory, S. D. (2024). Heartmate 3 for heart failure with preserved ejection fraction: In vitro hemodynamic evaluation and anatomical fitting. Annals of Biomedical Engineering, 52(12), 3208–3218. https://doi.org/10.1007/s10439-024-03585-y
