Newborn Adaptations Flashcards
Where does oxygenated blood from the placenta go on its path around the body step by step.
Placenta, Umbilical Vein, Ductus Venosus, Inferior Vena Cava, RA, some goes to RV some to foramen ovale to LA to Aorta to body. RV blood goes to pulmonary artery but due to high resistance in lungs and low resistance in systemic system it flows from to the ductus arteriosus then to Aorta
What is the ductus arteriosus?
A normal blood vessel that connects the pulmonary artery and aorta.
When does the ductus arteriosus close?
24-48 hours
What causes the ductus arteriosus to close?
increased arterial oxygen tension and decrease in blood flow through the ductus arteriosus causes the ductus to constrict and functionally close by 12 to 24 hours of age
What % of blood reaches the babies lungs while in utero?
8%- most blood is directed through the ductus arteriosus
What is the role of umbilical arteries?
To bring deoxygenated blood from the body of the newborn to the placenta to become oxygen rich.
What occurs in the neonates system once the placenta has been removed from the systemic system?
systemic vascular resistance begins to rise
What happens to the lungs following birth?
Pulmonary pressures begin to decrease, fluid is excreted or absorbed, oxygen fills and expands aveoli, .
How does fetal blood become oxygenated?
Red blood cells (maternal) will offload oxygen and fetal will offload C02.
What side of the heart has lower pressure before birth?
Higher on the right side
At term how much pulmonary fluid is in the lungs?
hold 25ml/kg of pulmonary fluid
Fill in the blank: The pressure in the fetal lungs before birth is __________, which allows blood from the _____________ to shunt into the ______________ via the __________________.
high, pulmonary artery, aorta, ductus arteriosus
Fill in the blank: In the fetus’ circulation before birth the pressure is ____________ on the right side of the heart compared to the left side. This causes some of the blood from the _________ atrium to flow into the __________ atrium via the ______________.
lower, right, left, foramen ovale
After the birth of the baby, heart circulation changes due to the closure of the shunting structures in the baby’s circulatory system.
The pressure in the right side of the heart decreases compared to the left side.
The resistance in the lungs decreases.
Oxygen levels in the baby’s body increase.
What causes the ductus arteriosus to close?
The placenta produces prostaglandins. When it is removed the production of prostaglandin production decreases, which causes the ductus arteriosus to close.
