Fetal conditions - Fetal circulation Flashcards Preview

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Flashcards in Fetal conditions - Fetal circulation Deck (6)
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1
Q

Shunt closure

  • Ductus venosus
  • Ductus arteriosus
  • Foramen ovale
A
  • Ductus venosus
    • Functional – 10-96 hours
    • Anatomic – 2-3 weeks
  • Ductus arteriosus
    • Functional – 10-12 hours
    • Anatomic – 2-3 weeks
  • Foramen ovale
    • Functional – Several minutes
    • Anatomic – 3 months
  • Memory aid:*
  • Magic number is 3 for anatomic closure
2
Q

Shunt remnant

  • Ductus venosus
  • Ductus arteriosus
  • Foramen ovale
A
  • Ductus venosus
    • Ligamentum venosum
    • Falciform ligament
  • Ductus arteriosus
    • Ligamentum arteriosum
  • Foramen ovale
    • Fossa ovalis
  • Summary:*
  • The ductus becomes ligamentum
3
Q

Blood vessel closure

  • When
  • Remnant
    • Umbilical artery
    • Umbilical vein
A
  • When
    • Umbilical artery
      • 3-4 days
    • Umbilical vein
      • 3-4 days
  • Remnant
    • Umbilical artery
      • Umbilical ligament
    • Umbilical vein
      • Ligamentum teres
  • Memory aid:*
  • AVA become UL-LT-UL
4
Q

Pathway of oxygenated blood

A

Umbilical vein → ductus venosus → IVC → RA → foramen ovale → LA → LV → Aorta

5
Q

Pathway of unoxygenated blood

A

SVC → RA → RV → pulmonary trunk → ductus arteriosus → aorta

6
Q

The ____ may persist as the ____ arteries which supply the urinary bladder

A
  • Proximal portion of the umbilical artery
  • Superior vesical