SFOS 27

Card Set Information

Author:
zf2010
ID:
80260
Filename:
SFOS 27
Updated:
2011-04-17 21:54:04
Tags:
Fetal Neonatal Cardiovascular Transition
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Description:
SFOS 27
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  1. When does human heart begin to beat?
    Week 4
  2. What carries fetal blood to placenta?
    Umbilical arteries
  3. Ductus Venosus
    Connects umbilical vein directly to IVC
  4. Foramen Ovale
    Opening in atrial septum to bypass pulmonary system
  5. Ductus arteriosus
    • Connects pulmonary artery to descending aorta
    • To bypass pumonary system
  6. Fetal compensation methods for decreased O2
    • Increase umbilical venous resistance to improve exchange
    • Increase of % flow across foramen ovale
    • Redistribution to vital organs
  7. Result of first breath
    • Expansion of lung sharply drops pulmonary resistance
    • Stimulates NO production (vasodilator)
    • Closes ductus arteriosus, foramen ovale
  8. 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
  9. Hypoplastic left heart syndrome
    • Left heart obstruction
    • Fetal coronary perfusion via ductus arteriosus
    • Upon closure, acidosis/death

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