Alfuadi , R.M. et al. 2025. The Left Atrioventricular Coupling Index as a Predictor of Major Cardiovascular Events in Chronic Heart Failure Patients at Adam Malik Hospital Medan. Journal of Society Medicine. 4, 6 (Jun. 2025), 188–196. DOI:https://doi.org/10.71197/jsocmed.v4i6.220.