AF: atrial flutter; Afib: atrial fibrillation; ECG: electrocardiogram; IAS: inter-atrial septum; LA: left atrium; LAH: left atrial hypertrophy/dilatation; LBBB: left bundle branch block; LV: left ventricle; LVH: left ventricular hypertrophy; PA: pulmonary artery; RV: right ventricle.