Key result
MAC-associated mitral stenosis imposes a greater energetic burden on ventricular flow than rheumatic mitral stenosis.
Why the study?
Mitral stenosis caused by rheumatic disease and mitral annular calcification have unique effects on valve morphology and pathophysiology, but differences in transmitral vortex formation and stroke energetics between these etiologies are not well characterized.
Three-dimensional FSI simulations reveal that MAC-associated mitral stenosis imposes a greater energetic burden on ventricular flow than rheumatic mitral stenosis, highlighting etiology-specific hemodynamic signatures not captured by standard clinical metrics.
Captured external expert commentary on this paper, strongest first. Original sources are linked where available.
“What's striking is that patients with MAC-related stenosis can appear to have a reasonably sized opening on imaging yet experience pressure gradients and energy losses that indicate much more severe obstruction.”
“For decades, mitral stenosis has been assessed using a one-size-fits-all approach. But MAC-related stenosis behaves differently. The valve structure is different and blood flow patterns are different, and the relationship between anatomy and severity doesn't follow the same rules.”
Greater energetic burden in MAC mitral stenosis warrants etiology-specific assessment beyond orifice metrics; leaves open clinical outcomes and management implications.
Purpose Mitral stenosis (MS) accounts for 12% of cardiac patients with single valve disease. There are two main causes: rheumatic disease of the mitral valve (MV) and mitral annular calcification (MAC). While both result in increased transmitral pressure gradients, each has unique effects on valve morphology and pathophysiology. We aimed to study differences in transmitral vortex formation and stroke energetics between the two valve types. We created an in silico experimental system using an immersed finite element-finite difference fluid-structure interaction (FSI) scheme and performed three-dimensional flow field analysis. Materials and Methods Patient-specific, echocardiographic-derived geometries from a healthy MV, a MAC-associated MS valve, and a rheumatic disease-associated MS (RMS) valve were translated into finite element meshes and situated within a left ventricle model driven by a pump-approximating pressure boundary condition at 70 bpm and cardiac outputs of 1.5, 3, 3.5, and 5 L/min over eight cycles. Results RMS had smaller geometric and effective orifice areas than MAC, but the RMS–MAC differences in mean transmitral pressure gradient and peak transmitral velocity depended on cardiac output. Across equivalent cardiac output conditions, the MAC case required greater pump stroke work and exhibited higher three-dimensional ventricular kinetic energy and viscous energy dissipation than the RMS case. Both diseased cases showed disrupted mitral vortex formation. Conclusion Three-dimensional FSI simulations suggest that MAC-associated MS may impose a greater energetic burden on ventricular flow than RMS, revealing etiology-specific hemodynamic signatures and providing potential mechanistic insight for improved characterization of MS, warranting further investigation with an expanded valve cohort.
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Davey et al. (2026) studied Mitral Stenosis (Rheumatic and Calcific) (n=3). Mitral annular calcification (MAC)-associated mitral stenosis vs. Rheumatic mitral stenosis and healthy mitral valve was evaluated on Ventricular flow energetics (pump stroke work, kinetic energy, viscous energy dissipation) (p=<0.005). MAC-associated mitral stenosis imposes a significantly greater energetic burden on ventricular flow than rheumatic mitral stenosis across equivalent cardiac outputs.
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