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Mrs.Rekha Stalin.
MSc nuring.(OBG)
DEFINITION
The fetal circulation is the circulatory system of a
human fetus, often encompassing the entire
fetoplacental c...
PATHWAY
Placenta
Umbilical Vein
Umbilical Arteries
Liver
Ductus Venosus
Inferior Venacava
Right Atrium
Foramen Ovale
Right...
Umbilical Cord
2umbilical arteries:
return non-oxygenated blood, fecal waste,
CO2 to placenta
1umbilical vein:
brings ox...
Three shunts are present in fetal life:
1. Ductus venosus: connects the umbilical vein to
the inferior vena cava
2. Ductus...
PATHWAY
Oxygenated blood from the placenta
through umbilical vein
fetus
liver
Receives deoxygenated blood from the portal ...
During ventricular systole
Left ventricular blood Right ventricular blood
pumped with < o2 content
Ascending aorta and dis...
During fetal life
350ml per kg per min
Cardiac Output
Following birth
500ml per min
Heart Rate 120-140per min
At birth
 Clamping the cord shuts down low-pressure
system
 Increased atmospheric pressure(increased
systemic vascular r...
Neonatal circulation
Changes in the Fetal Circulation
after birth
 Umbilical arteries → Umbilical ligaments
 Umbilical vein → Ligamentum tere...
Fetal Vs Infant Circulation
Fetal Infant
• Low pressure system
• Right to left shunting
• Lungs non-functional
• Increased...
Fetal circulation
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Fetal circulation

  1. 1. Mrs.Rekha Stalin. MSc nuring.(OBG)
  2. 2. DEFINITION The fetal circulation is the circulatory system of a human fetus, often encompassing the entire fetoplacental circulation which includes the umbilical cord and the blood vessels within the placenta that carry fetal blood.
  3. 3. PATHWAY Placenta Umbilical Vein Umbilical Arteries Liver Ductus Venosus Inferior Venacava Right Atrium Foramen Ovale Right Lung Arch of Aoarta Ductus Arteriosus Left Atrium Left Ventricle Right Ventricle Portal Vein
  4. 4. Umbilical Cord 2umbilical arteries: return non-oxygenated blood, fecal waste, CO2 to placenta 1umbilical vein: brings oxygenated blood and nutrients to the fetus
  5. 5. Three shunts are present in fetal life: 1. Ductus venosus: connects the umbilical vein to the inferior vena cava 2. Ductus arteriosus: connects the main pulmonary artery to the aorta 3. Foramen ovale: anatomic opening between the right and left atrium.
  6. 6. PATHWAY Oxygenated blood from the placenta through umbilical vein fetus liver Receives deoxygenated blood from the portal vein through ductus venosus Inferior vena cava Right atrium of heart through foramen ovale Left atrium of the heart Left ventricle of the heart
  7. 7. During ventricular systole Left ventricular blood Right ventricular blood pumped with < o2 content Ascending aorta and distributed is discharged by their branches to the heart, Pulmonary arteries head,neck,brain,arms. Ductus arteriosus Descending aorta Hypogastric arteries Umbilical arteries Placenta
  8. 8. During fetal life 350ml per kg per min Cardiac Output Following birth 500ml per min Heart Rate 120-140per min
  9. 9. At birth  Clamping the cord shuts down low-pressure system  Increased atmospheric pressure(increased systemic vascular resistance) causes lungs to inflate with oxygen  Lungs now become a low-pressure system
  10. 10. Neonatal circulation
  11. 11. Changes in the Fetal Circulation after birth  Umbilical arteries → Umbilical ligaments  Umbilical vein → Ligamentum teres Shunt Functional closure Anatomical closure Remnant Ductus arteriosus 10 – 96 hrs after birth 2 – 3 wks after birth Ligamentum arteriosum Formamen ovale Within several mins after birth One year after birth Fossa ovalis Ductus venosus Within several mins after birth 3 – 7 days after birth Ligamentum venosum
  12. 12. Fetal Vs Infant Circulation Fetal Infant • Low pressure system • Right to left shunting • Lungs non-functional • Increased pulmonary resistance • Decreased systemic resistance •High pressure system •Left to right blood flow •Lungs functional •Decreased pulmonary resistance •Increased systemic resistance
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