Maturational patterns in right ventricular strain mechanics from the fetus to the young infant.

•Myocardial strain imaging is validated method to characterize right ventricular function in fetuses and neonates.•Major hemodynamic alterations of cardiovascular transition distinguish the fetal period from the postnatal period.•This study establishes clinically relevant patterns of RV strain mechanics from early gestation through the one year.•Developmental RV strain mechanics are gestational- and postnatal age- specific.