Influence of morphologic subtype on survival in mBT shunt classical Norwood patient cohort. K–M survival curves illustrated. (A) As with the Sano cohort, patients with atypical variant morphologies showed a trend towards poorer 30-day and 1-year survival, though not statistically significant. (B) When comparing all morphologic classes, patients with AA-MS morphology exhibited a trend towards worse survival at 30 days, similar to those patients with atypical morphologies. Beyond 100 days, however, only the atypical morphology patients showed a persistent trend towards poorer outcome as the survival curves for the typical morphologies converged.