There are multiple definitions:

1. left atrial volumetric/mechanical coupling index(English)

   • calculated as (left atrial volume index)/(tissue-doppler-imaging a’). Higher value (mL.s/cm per m2) is strongly, independently, and incrementally associated with excess mortality, irrespective of FMR grade
   • FMR, LA, HFrEF, LAVI, TDI
   • Cardiology, Doppler technique
   • https://doi.org…GING.120.011608
   • https://doi.org…cvd.2022.04.011

2. left atrioventricular coupling index(English)

   • defined as the ratio of LAV and EDV. Introduced as a prognostic marker of CV events in HFpEF. Also is able to predict incident atrial fibrillation
   • CVD, EDV, LA, HFpEF, LAV, LV, AF, LASI
   • Cardiology, Ratio-based metric, Model(ing)
   • https://doi.org…cmg.2023.03.012
   • https://doi.org…8/radiol.210315