Left atrioventricular coupling index
LACI
LACI was calculated as a ratio between CMR-derived LA EDV and LV EDV as previously defined [LACI value is expressed as a percentage. Consequently, a higher LACI reflects a greater imbalance between the LA and LV volumes at ventricular end-diastole suggesting greater impairment of left atrioventricular coupling (Fig. Left atrioventricular coupling index (LACI). 