http://www.angirx.com/blog/congenital-heart-disease-questions/
congenital heart disease questions
tough question?
The fact that two of the diversion structures of the fetus to be destroyed after birth can cause heart disease defects, in which they have bad youngeter Woulfe oxygenated blood. That two structures are these?
The fetal blood bypass the structures of ductus arteriosus connects the aorta to the pulmonary artery and connecting the foramen ovale to the left and right atrium. Normally, these two are closed after birth, when the lung expands and the pulmonary pressure decreases. In fetal life, blood passes from the pulmonary artery to the descending aorta and right atrium atrium left. After birth as the pulmonary artery pressure decreases, reverses the shunt from the aorta to the pulmonary artery and left atrium atrium left. So no bad oxygenated blood that reaches the general circulation. Just move oxygenated blood to the pulmonary circulation. After a long period, pulmonary vessels are damaged due to high flow and pressure increases again. With increased pulmonary pressure, the flow is reversed again so that poorly oxygenated blood begins to flow into the general circulation (systemic circulation) of the pulmonary circulation through the ductus arteriosus and foramen ovale (ASD).