Fetal Circulation

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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...

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•Foetal Circulation: The circulation of oxygenated blood, de-oxygenated blood, nutritive material etc in the foetus is ter...1. Umblical Vein:  It carries the oxygenated blood from the placenta to the growing fetus.  The blood pressure inside th...2. Umblical Artery:  It is a paired artery that is found in the pelvic and abdominal region of the fetus which extends in...•Shunts Involved In Foetal Circulation: There are three shunts present in a fetus, they are: 1. Ductus Venosus. 2. Ductus ...1. Ductus Venosus:  The Ductus Venosus shunts the portion of left umblical vein blood flow directly to the inferior vena ...3. Foramen Ovale:  It is an opening in the intra-atrial septum.  It allows the blood to enter the left atrium from the r...Steps Of Foetal Circulation: Step.1: The placenta accepts the bluest blood (blood without oxygen) from the fetus through b...Step.3: The red blood then returns to the fetus via the umbilical cord (umbilical vein). Step.4: The red blood that enters...Step.6: ۞ Blood coming back from the fetus’s body also enters the right atrium, but the fetus is able to send this blue bl...Step.7: ۞ The ductus arteriosus sends the bluer blood to the organs in the lower half of the fetal body. ۞ This also allow...•The Circulatory Changes After Birth: Ѡ The Placenta is replaced by the Lungs as the organ of respiratory exchange. Ѡ The ...• What happens to the shunts at birth? Ѡ Closure of the Ductus Venosus. Ѡ Closure of the Foramen Ovale. Ѡ Closure of the D...Ѡ Closure of the Ductus Venosus: 1. Functional closure occurs within minutes of birth. 2. Structural closure occurs within...Ѡ Closure of the Ductus Arteriosus: 1. Closure of ductus arteriosus is by smooth muscle contraction. 2. It is further repl...Ѡ Closure of the Foramen Ovale: 1. Before birth the foramen ovale allows most of the oxygenated blood entering the right a...‽ The Umblical arteries carry Deoxygenated blood. ‽ The Umblical veins carry Oxygenated Blood. ‽ When placental blood flow...‽ Oxygen in fetal circulation is 15-20 mmHg. ‽ Oxygen after birth increases to 100 mmHg. ‽ The right Ventricular wall is t...Foetal circulation pptFoetal circulation pptFoetal circulation pptFoetal circulation pptFoetal circulation pptFoetal circulation pptFoetal circulation pptFoetal circulation pptFoetal circulation pptFoetal circulation pptFoetal circulation pptFoetal circulation ppt

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Powerpoint Templates Page 2 DEFINITION The circulation of oxygenated blood, de-oxygenated blood, nutritive material etc in...Powerpoint Templates Page 3 The Placenta 3 The circulatory system of the mother is not directly connected to that of the ...Powerpoint Templates Page 4 Anatomy and Physiology Fetal Circulation • Umbilical cord – 2 umbilical arteries: return non-o...Powerpoint Templates Page 5 Three shunts are present in fetal life: 1. Ductus venosus: connects the umbilical vein to the ...Powerpoint Templates Page 6 Fetal Circulation 6 Powerpoint Templates Page 7 How does the blood move?? • Umbilical VEIN carries oxygenated blood and nutrients from the pla...Powerpoint Templates Page 8 Fetal Circulation • Ductus Venosus it allows oxygenated blood from the placenta to bypass the ...Powerpoint Templates Page 9 Foramen Ovale 9 Powerpoint Templates Page 10 What happens to the blood after it reaches the right atrium?? • Blood flows right into the le...Powerpoint Templates Page 11 Fetal Circulation • Some of the blood entering the right atrium does not pass directly to the...Powerpoint Templates Page 12 Ductus Arteriousus 12 Powerpoint Templates Page 13 Fetal Circulation • After it proceeds to the left ventricle where it is pumped to the heart a...Powerpoint Templates Page 14 Placenta Umbilical Vein Umbilical Arteries Liver Ductus Venosus Inferior Venacava Right Atriu...Powerpoint Templates Page 15 What about the rest of the blood?? • The blood still in the right atrium goes into the right ...Powerpoint Templates Page 16 What is happening further down?? • Some of the blood moves from the aorta through the interna...Powerpoint Templates Page 17 PATHWAY Oxygenated blood from the placenta through umbilical vein fetus liver Receives deoxyg...Powerpoint Templates Page 18 During ventricular systole Left ventricular blood Right ventricular blood pumped with < o2 co...Powerpoint Templates Page 19 What happens after birth? • Once the baby is born and the lung, renal, digestive and liver fu...Powerpoint Templates Page 20 • at birth • Closure of the Ductus Venosus. • Closure of the Foramen Ovale. • Closure of the ...Powerpoint Templates Page 21 SUMMARY

 

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Fetal circulation

Anatomy and Physiology Fetal Circulation Umbilical cord  2 umbilical arteries: return de- oxygenated bloo...Special Structures in Fetal Circulation Placenta – Where gas exchange takes place during fetal .life Umbilical Arteri...Flow Chart of Fetal Circulation Anatomy and Physiology  Fetus depends on placenta to meet O2 needs while organs continue formation  Oxygenated b...After reaching fetus theblood flows through theinferior vena cava Fetal Circulation Blood continues to travel to the inferior vena cava from the ductus venosus Ductus Venosus ...Fetal Circulation Blood continues to travel up the inferior vena cava Empties into the right atrium of the heart The ...Fetal Circulation Foramen ovale  Small opening in the septum of the heart  Completely bypasses the non...Fetal Circulation From the right atrium, the blood goes to the right ventricle then to the pulmonary arteries Pul...Fetal Circulation Blood travels back from aorta to the two umbilical arteries to the placenta The placenta will r...Why more blood flow directly to the Left atrium? Due to the higher pressure of the blood in the inferior vena cav...Fetal Circulation Low pressure system  Lungs are closed  Most oxygenated blood flows between the atria of th...Conversion of Fetal to Infant Circulation At birth  Clamping the cord shuts down low-pressure system  Increase...Conversion: Fetal to Infant Circulation  In the left side of the heart causes the foramen ovale to close.  More h...What happens to these special structures after birth?  Umbilical arteries atrophy  Umbilical vein becomes part of th...Overview of Conversion Umbilical cord is clamped Loose placenta Closure of ductus venosus Blood is transported...Loss of placenta also leads to : First breath Lungs expand and fluid is expelled Decreased pulmonary resistance ... Loss of placenta Increased systemic resistance Pressure in right atrium decreased Change from right to left s...Fetal vs. Infant Circulation Fetal  Infant Low pressure system  High pressure system ...Conclusion Oxygenated blood enters the umbilical vein from the placenta Enters ductus venosus Passes through i.... Enters superior vena cava  Goes to right atrium  Enters the right ventricle  Enters pulmonary artery with so...FetalcirculationFetalcirculation

 

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