Pulmonary hypertension due to spontaneous premature ductal constriction in fetal life: association with right bundle branch block.

We describe a case of fetal pulmonary hypertension and tricuspid regurgitation due to non pharmacologically induced ductal constriction observed at 36 weeks' gestational age. The hypertension resolved spontaneously soon after birth, with no functional consequences. Right bundle branch block is the only permanent anomaly, still being seen on the electrocardiogram at the age of 34 months.