4
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Total Neo-pulmonary Artery Index [TNPAI]
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Suggested as an indicator of postoperative RV/LV pressure ratio.
TNPAI is calculated by determining the cross-sectional area of the PAs
(as described by Nakata et.al.) and the MAPCAs and dividing the result
by body surface area (mm2/m2).
TNPAI = APC index + Nakata index / BSA
Where, APC index is the sum of CSA of all usable APC’s
N.B. − APC = aortopulmonary collaterals; CSA = Cross-sectional
area
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