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Pulmonary hypertension is defined as a mean pulmonary arterial pressure ≥25 mmHg. Pulmonary hypertension in congenital heart diseases is commonly secondary to left-to-right shunt defects or left heart obstructive disease causing postcapillary hypertension .
Common defects causing this disorder include VSD, atrial septal defect (ASD) and persistent ductus arteriosus (PDA).
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Initially, pulmonary arterial hypertension (PAH) will be reversible in case of early diagnosis and treatment.
Irreversible
But with time, as the remodeling occur at the level of pulmonary blood vessels to accommodate the blood overflow. This will increase pulmonary vascular resistance (PVR). And the PAH due to increased PVR is usually