The flashcards below were created by user
on FreezingBlue Flashcards.
When does human heart begin to beat?
What carries fetal blood to placenta?
Connects umbilical vein directly to IVC
Opening in atrial septum to bypass pulmonary system
- Connects pulmonary artery to descending aorta
- To bypass pumonary system
Fetal compensation methods for decreased O2
- Increase umbilical venous resistance to improve exchange
- Increase of % flow across foramen ovale
- Redistribution to vital organs
Result of first breath
- Expansion of lung sharply drops pulmonary resistance
- Stimulates NO production (vasodilator)
- Closes ductus arteriosus, foramen ovale
Result of Right Heart Obstruction
- Hypoxemia after ductus arteriosus closure
- Limited flow to lungs from right ventricle
Note: tricuspid regurgitation, right atrial enlargement, foramen ovale enlargement
Hypoplastic left heart syndrome
- Left heart obstruction
- Fetal coronary perfusion via ductus arteriosus
- Upon closure, acidosis/death