The inferior vena cava is grafted on to the pulmonary arteries if this was not done previously.
Fundamental to this is the extent and depth of trophoblast invasion into uterine arteries in the early weeks of pregnancy.
Reduced invasion will leave the spiral arteries vasoreactive, and thus more likely to undergo spontaneous transient vasoconstriction.
Chronic constriction of the infrarenal aorta or of the uterine arteries themselves most consistently raised blood pressure.
Other investigators have noted analogous findings in the mesenteric arteries from other animals.
In preeclampsia, an inadequate placental trophoblast invasion of the maternal uterine spiral arteries results in poor placental perfusion, leading to placental ischaemia.
Such analysis should in future improve our understanding of the fate of the pulmonary arteries following the bidirectional cavopulmonary anastomosis.
In both normal and defective hearts, however, the arterial duct is smaller than both the left and right pulmonary arteries.
