Fetal growth of left-sided structures and postnatal surgical outcomes in the "borderline" left heart varies by cardiac phenotype.

The left sided cardiac structures grow at a faster rate in fetuses with severe LHH than in fetuses with severe AS, and the Z-scores decrease at a slower rate in fetuses with severe LHH than those with severe AS. A majority of infants in the LHH group did not undergo single ventricle palliation. This information can be useful in counselling expectant families on the expected growth potential of the aortic valve, mitral valve, and LV depending on the cardiac phenotype. This article is protected by copyright. All rights reserved.