Alfuadi , Rifki Mirza, Anggia Chairuddin Lubis, and Yuke Sarastri-Hilfan Ade Putra. 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):188-96. https://doi.org/10.71197/jsocmed.v4i6.220.