Electromechanical activation and recovery wave imaging for pediatric mitral valve disease characterization.
M, T., C, P., SJ, H., JB, T., M, K., R, W., R, M., Y, W., YA, E., & A, A. (2026). Electromechanical activation and recovery wave imaging for pediatric mitral valve disease characterization.. Proceedings of the National Academy of Sciences of the United States of America. https://doi.org/10.1073/pnas.2503559123
M T, C P, SJ H, JB T, M K, R W, et al. Electromechanical activation and recovery wave imaging for pediatric mitral valve disease characterization.. Proceedings of the National Academy of Sciences of the United States of America. 2026; doi: 10.1073/pnas.2503559123
M T, C P, SJ H, et al. Electromechanical activation and recovery wave imaging for pediatric mitral valve disease characterization.[J]. Proceedings of the National Academy of Sciences of the United States of America. 2026. DOI: 10.1073/pnas.2503559123.
@article{m2026,
author = {Tourni M and Proestaki C and Han SJ and Tonko JB and Kucinski M and Weber R and Minyety R and Wolicki Y and Elnabawi YA and Afentouli A},
title = {Electromechanical activation and recovery wave imaging for pediatric mitral valve disease characterization.},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
year = {2026},
doi = {10.1073/pnas.2503559123},
note = {PMID: 42607199},
}
TY - JOUR AU - Tourni M AU - Proestaki C AU - Han SJ AU - Tonko JB AU - Kucinski M AU - Weber R AU - Minyety R AU - Wolicki Y AU - Elnabawi YA AU - Afentouli A TI - Electromechanical activation and recovery wave imaging for pediatric mitral valve disease characterization. T2 - Proceedings of the National Academy of Sciences of the United States of America PY - 2026 DO - 10.1073/pnas.2503559123 AN - PMID:42607199 ER -
Mitral valve (MV) disease, particularly MV prolapse (MVP) and mitral regurgitation (MR), affects 2 to 5% of the population and poses a substantial arrhythmogenic risk, with 43% of MVP patients developing arrhythmias. Although less common in children, the absence of comorbidities can uniquely isolate early electromechanical alterations that may elucidate mechanisms later contributing to arrhythmic risk and devastating effects such as sudden cardiac death. Conventional echocardiography lacks sensitivity for MV electromechanics, motivating advanced approaches. We introduce Electromechanical Wave Imaging (EWI), a high-frame-rate echocardiography modality, to map MV-complex activation and diastolic recovery in N = 21 MVP, MR, and control pediatric subjects (13.10 ± 4.51 y old, 43% male). A preclinical canine study (n = 3) established EWI's ability to observe temporally coupled electromechanical wave propagation across the atrioventricular junction through the closed MV-following atrial and preceding ventricular activation (73.0 ms, 60 BPM). MVP patients exhibited significantly delayed left ventricular (LV) activation (76.04 ± 12.51 ms vs. 47.64 ± 2.57 ms in controls, P = 0.0013), primarily in papillary muscles. Both MVP and MR-only subjects exhibited prolonged LV recovery, with MR-only patients showing significantly longer recovery intervals (MR-only: 277.0 ± 27.61 ms, Control: 248.7 ± 10.43 ms, MVP vs. Control: MR-only vs. Control: P = 0.0395). In two arrhythmogenic MVP cases, EWI localized arrhythmic exit sites adjacent to LV papillary muscles, coinciding with regional delayed sinus activation, aligning with invasive electrophysiology. This study demonstrates that atrioventricular valve function dictates cardiac electromechanical function and establishes full-cycle EWI as a transformative tool for diagnosing MV disease electromechanical effects, assessing arrhythmic risk, guiding interventions, and advancing noninvasive cardiac imaging.