Related Experiment Video
Updated: May 16, 2026
Point-of-Care Ultrasound for Peripheral Veno-Arterial Extracorporeal Membrane Oxygenation Without Left Ventricular Venting
Published on: January 17, 2025
Baseline Ventricular-Arterial Coupling Modifies Left Atrial Pressure Response to Venoarterial Extracorporeal Membrane
Christian Said1,2,3, Christopher Hayward1,2,3, Ricardo Deveza1,2,3
1The University of New South Wales, Kensington, New South Wales, Australia.
Background:
Venoarterial extracorporeal membrane oxygenation (VA-ECMO) increases systemic afterload, potentially elevating mean left atrial pressure (mLAP). How baseline ventricular-arterial coupling modifies this effect remains unclear. Our aim was to determine how baseline cardiac power output (CPO) and systemic vascular resistance (SVR) modify the mLAP response to VA-ECMO, with or without valvular regurgitation.
Methods:
Using a biventricular mock circulatory loop with peripheral VA-ECMO cannulation, we simulated 12 cardiogenic shock states. Measurements were obtained at baseline and at VA- ECMO pump speeds of 2000-4000 RPM. Results were stratified by baseline SVR (< 20 vs. ≥ 20 Wood units), CPO (< 0.20 vs. ≥ 0.20 W) and valve competence. Severe aortic and mitral regurgitation were tested independently as additional conditions.
Results:
With competent valves, mLAP decreased from 27.0 ± 0.2 mmHg at baseline to 19.0 ± 0.6 mmHg at 3000 RPM, then increased to 22.0 ± 0.9 mmHg at 4000 RPM. High baseline SVR produced greater mLAP reduction at 3000 RPM (15.0 ± 0.6 vs. 20.0 ± 0.7 mmHg, p < 0.001) but steeper rebound at 4000 RPM (26.0 ± 1.1 vs. 20.0 ± 0.9 mmHg, p < 0.001) compared to low SVR. Higher baseline CPO (≥ 0.20 W) maintained lower mLAP at higher speeds (16.0 ± 0.6 vs. 21.0 ± 0.7 mmHg at 3500 RPM; p < 0.001). Aortic regurgitation (AR) elevated mLAP above baseline (36.0 ± 1.5 vs. 22.0 ± 0.9 mmHg at 4000 RPM; p < 0.001), amplified by high SVR (47.0 ± 1.1 vs. 29.0 ± 0.8 mmHg at 4000 RPM). Mitral regurgitation elevated mLAP above baseline at higher pump speeds (32.0 ± 1.4 vs. 22.0 ± 0.9 mmHg at 4000 RPM; p < 0.001).
Conclusions:
Baseline ventricular-arterial coupling modifies mLAP response to VA-ECMO. Low CPO with high SVR, particularly with AR, narrows the safe pump speed window and may require early left ventricular unloading, inotropic support, or vascular resistance optimization. These findings support phenotype-guided VA-ECMO titration.
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