ASD, atrial septal defect BPV, balloon pulmonary valvuloplasty BSA, body surface area Balloon pulmonary valvuloplasty Critical pulmonary stenosis ECG, electrocardiogram Infants Journal Article PADP, pulmonary artery diastolic pressure PASP, pulmonary artery systolic pressure PDA, patent ductus arteriosus PFO, patent foramen ovale PG, pressure gradient PR, pulmonary regurgitation PS, pulmonary stenosis PV, pulmonary valve RV, right ventricle RVDP, right ventricular diastolic pressure RVOT, right ventricular outflow tract RVSP, right ventricular systolic pressure TR, tricuspid regurgitation TTE, transthoracic echocardiography VSD, ventricualr septal defect