Mekanisme Disfungsi Ventrikel Kiri Akibat Alat Pacu Jantung Permanen: Kajian terhadap miR-155, sTNFR-2, MMP-9, N-Cad, dan ZO-1 = Mechanism of Left Ventricular Dysfunction due to Permanent Pacemaker: An Analysis of miR-155, sTNFR-2, MMP-9, N-Cad, dan ZO-1