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Pulmonary vasculopathy grades by PH severity (none, mild-moderate and severe PH). Briefly, Grade 0—normal; Grade 1—medial thickening; Grade 2—medial hypertrophy; Grade 3—concentric intimal fibrosis; Grade 4—plexiform lesions (for full description, see Heath and Edwards scheme, table 1). PH, pulmonary hypertension.
