[Verse 1] When truncus arteriosus needs repair We measure pulmonary vessels with care Take the radius of left PA squared Times pi, then right PA prepared Add them up and divide by BSA That's Nakata's way to assess today [Chorus] Three hundred or above means adequate flow One fifty to three hundred, borderline we know Below one fifty means inadequate space Nakata Index shows the PA case Pi r squared for left and right Divided by body surface, shining light [Verse 2] Pre-operative at three thirty-seven Good surgical candidate, we're in heaven But three months later, one thirty-seven PA growth is lagging, that's the lesson When the index falls despite the time Right ventricle faces uphill climb [Chorus] Three hundred or above means adequate flow One fifty to three hundred, borderline we know Below one fifty means inadequate space Nakata Index shows the PA case Pi r squared for left and right Divided by body surface, shining light [Bridge] Afterload rising when branches don't grow Somatic growth outpaces what we need to know Intervention time to help PAs expand Promote the growth with surgical hand [Chorus] Three hundred or above means adequate flow One fifty to three hundred, borderline we know Below one fifty means inadequate space Nakata Index shows the PA case Pi r squared for left and right Divided by body surface, guiding sight [Outro] When Nakata falls, we intervene To help those pulmonary arteries grow between The formula's simple, the message is clear Adequate vessels keep the pathway near
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