Tricuspid valve abnormalities (including Ebstein's anomaly) are congenital heart defects – that is, they were present when a child is born. Around eight in every 1,000 babies born have a congenital heart defect, though Ebstein's anomaly is rarer than that.
Transposition of the great arteries is a condition where that the two main blood vessels leaving the heart, the pulmonary artery (which takes blood to the lungs to pick up oxygen) and the aorta (which takes blood from the heart to the body) are swapped over (switched).
This page from Great Ormond Street Hospital (GOSH) explains tracheal stenosis, how it can be treated and what to expect when a child has treatment. This page mainly concentrates on the ‘long segment’ type of tracheal stenosis and its treatment.
The ductus arteriosus is a blood vessel that connects the pulmonary artery (main vessel supplying the blood to the lungs) to the aorta (main vessel supplying the blood to the body). This connection is present in all babies in the womb, but should close shortly after birth. In some babies, especially in those born prematurely, this vessel may remain open. This is called a patent or persistent ductus arteriosus.