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Table 2 Proposed criteria for closing cardiac shunts in PAH-CHD [6]

From: The spectrum of pulmonary arterial hypertension in adults with congenital heart disease: management from a physician and nurse specialist perspective

PVRI, WU×m2 PVR, WU Correctable
<4 <2.3 Yes
>8 >4.6 No
4–8 2.3–4.6 “Grey zone”: evaluate in specialist centres
  1. PVRI pulmonary vascular resistance indexed, WU wood units, m 2 square meters, PVR Pulmonary vascular resistance