Bulbulia, B.A. and Essop, A.R. 2025. Pulmonary Hypertension in Adults with Congenital Heart Disease (ACHD): Case Study of Undetected Atria Septal Defect. British Journal of Healthcare and Medical Research. 12, 04 (Aug. 2025), 246–253. DOI:https://doi.org/10.14738/bjhr.1204.19186.