Koirala I, Panthee N, Adhikari A, et al. Age and Defect Size as Predictors of Pulmonary Hypertension in Secundum Atrial Septal Defect: A Retrospective Study from the Himalayan Region. Nepalese Heart J. 2025;22(1):43-46. doi:10.3126/nhj.v22i1.78227