Pulmonary vascular resistance index (PVRI) = (PAP-PCWP) x 80 / CI
(normal: 200-400 dynes . sec/cm
5
/m
2
)
PAP = pulmonary artery pressure. (mm Hg)
PCWP = pulmonary capillary wedge pressure. (mm Hg)
CI (L/min/m
2
)