FETAL CIRCULATION | SHUNTS | WHY BABY CRYING IN IS IMPORTANT AFTER DELIVERY | umbilical cord

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​ @LOVE MEDICS
FETAL CIRCULATION

FETAL CIRCULATION - CONTENT
Introduction
Umbilical cord
Shunts
Pathway
Oxygen exchange
Cardiac output
Remnant
Changes of Remnant


Fetal circulation Introduction
The circulatory system of the fetus
Fetoplacental circulation
It Includes
Umbilical cord,
blood vessel in the placenta
It carry the fetal blood


Blood circulation
SVC , IVC & coronary sinus
Right atrium
TRICUSPID VALVE
Right ventricle
PULMONARY VALVE
PULMONARY ARTERY
LUNGS
PULMONARY VEIN
Lt atrium
BICUSPID VALVE
Lt ventricle
AORTIC VALVE
AORTA
BODY


UMBILICAL CORD


UMBILICAL ARTERY 2
Deoxygenated blood to the placenta
Blood, fetal waste, co2
UMBILICAL VEIN 1
Oxygenated blood and nutrition to the fetus


Shunt
DUCTUS VENOSUS
Umbilical vein - Inferior vena cava
DUCTUS ARTERIOSUS
pulmonary artery - Aorta
FORAMEN OVALE
RT atrium - LT atrium


OXYGEN EXCHANGE
IN PLACENTA ,
Oxygen exchange from maternal blood vessel to fetal blood vessel


HB LEVEL
MORE in Fetus
LESS IN Mother


CARDIAC OUTPUT & HEART RATE
HEART RATE = 120 - 140 bpm
CARDIAC OU- PUT
Before delivery 350 ml /kg / min
After delivery 500 ml /min
Lungs  become a low-pressure system
Increased atmospheric pressure causes lungs to inflate




REMNANT
Ductus arteriosus
Anatomical closure: 2-3 wks
Functional closure: 10 to 96 hrs after birth
Ductus venosus
Anatomical closure : 3 – 7 days
Functional closure: Afterbirth
Foramen ovale
Anatomical closure: 11- 1 yr
Functional closure: Afterbirth

Changes – fetus & adult
Ductus arteriosus
Ligamentus arteriosus
Ductus venosus
Ligamentus venosus
Foramen ovale
Fossa ovalis
Umbilical artery
Umbilical ligament
Umbilical vein
Ligamentum teres
Fetal circulation - overview
Fetal circulation
Oxygenated blood = placenta
= umbilical vein = fetus  liver
+
Deoxygenated blood from the portal vein - LIVER

LIVER = Ductus venosus = IVC & RT atrium foramen ovale = Lt atrium = Lt ventricle = ascending aorta = all parts of the body
Rt atrium = Rt ventricle = pulmonary. artery = Ductus arteriosus = descending aorta = Hypogastric artery = umbilical artery = placenta

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