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Paediatric pulmonary hypertension (PH) is a rare but life-threatening condition characterized by elevated pulmonary artery pressure and increased pulmonary vascular resistance, ultimately leading to right ventricular failure if untreated. Unlike adults, pediatric PH often occurs secondary to congenital heart defects (CHD), lung disease, or idiopathic causes. Understanding its pathophysiology and timely diagnosis is crucial for improving outcomes.