[Verse 1] When truncus arteriosus comes to play The aortic root's enlarged right from day one Seven point four one at the valve they say Pre-op Z-scores show the dilation's begun At sinus of Valsalva four point seven six ST junction three point seven seven in the mix [Chorus] Z-scores over three to five Mean dilation's alive Root replacement on the line When these numbers climb and climb Truncal root is bigger born Than normal hearts we've known before Progressive growth means we must warn Regurgitation's at the door [Verse 2] Three months post-op the valve drops down One point eight eight shows improvement found But sinus still at three point five three ST junction holds at three point six nine, you see The root remembers what it used to be Inherently larger, that's the key [Chorus] Z-scores over three to five Mean dilation's alive Root replacement on the line When these numbers climb and climb Truncal root is bigger born Than normal hearts we've known before Progressive growth means we must warn Regurgitation's at the door [Bridge] Seven months later what do we find The valve jumps back to five point one two Sinus at four three six, ST climbs too Four point five five, progression's not kind Watch for worsening regurgitation Root replacement consideration [Chorus] Z-scores over three to five Mean dilation's alive Root replacement on the line When these numbers climb and climb Truncal root is bigger born Than normal hearts we've known before Progressive growth means we must warn Regurgitation's at the door [Outro] Markedly elevated, that's the theme Progressive dilation, part of the scheme Monitor closely, plan ahead When Z-scores rise, don't fill with dread Root replacement saves the day When dilation won't go away
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