Group | Description |
---|---|
A | Persistent pulmonary hypertension of the newborn (PPHN) (belongs to Group 1 in table 1) i. Pulmonary vasoconstriction—eg, meconium aspiration syndrome ii. Abnormal pulmonary vascular remodelling—idiopathic PPHN iii. Diminished pulmonary vascular bed—pulmonary hypoplasia |
B | Pulmonary vein stenosis (Group 1') |
C | Pulmonary hypertension secondary to left heart disease (Group 2) |
D | Pulmonary hypertension secondary to lung diseases and/or hypoxia (Group 3) |