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Coarctation of the aorta, or aortic narrowing (abbreviated as CoA), is a congenital condition whereby the aorta narrows in the area where the ductus arteriosus (ligamentum arteriosum after regression) inserts.: Coarctation (narrowing) of the aorta. 1:Inferior vena cava, 2:Right pulmonary veins, 3: Right pulmonary artery, 4:Superior vena cava, 5:Left pulmonary artery, 6:Left pulmonary veins, 7:Right ventricle, 8:Left ventricle, 9:Pulmonary artery, 10:Aorta.
Placental abruption. Placental abruption is a condition where a part of the placenta separates from the uterus during pregnancy. There are many blood vessels within the placenta that transfer nutrients from the mother to the unborn baby.lacenta previa. The placenta usually implants and grows in the upper part of the uterus. In 0.5% to 1% of pregnancies, however, the placenta will implant in the lower part of the uterus, blocking the cervix, which is the opening from the uterus to the vagina.