RT LUNG LT LUNG LIVER PLACENTA Diagrammatic representation of fetal circulation
Diagrammatic representation of fetal circulation
Fetal circulation Gas and nutritional requirements exchange occurs in the placenta a Pulmonary blood flow is very low Foramen ovale and ductus arteriosus are opened a The blood saturation is higher in up limbs and head
◼ Gas and nutritional requirements exchange occurs in the placenta ◼ Pulmonary blood flow is very low ◼ Foramen ovale and ductus arteriosus are opened ◼ The blood saturation is higher in up limbs and head Fetal Circulation
Postnatal circulations Pulmonary ventilation, and respiration, pulmonary vascular resistance decreases rapidly, systemic blood saturation increased The ductus arteriosus closed by its contraction of muscular wall. which resulted by bradykinin By increasing in pulmonary blood flow, pulmonary venous return increased. com bined with a decrease in pressure within the right atrium, resulted in a closing of foramen ovale
◼ Pulmonary ventilation, and respiration, pulmonary vascular resistance decreases rapidly, systemic blood saturation increased ◼ The ductus arteriosus closed by its contraction of muscular wall, which resulted by bradykinin ◼ By increasing in pulmonary blood flow, pulmonary venous return increased, combined with a decrease in pressure within the right atrium, resulted in a closing of foramen ovale Postnatal Circulations
Postnatal circulation Ductus arterious closure full term baby: 80% closed within 24 hours after birth, 95%anatomic closure within the first year Total obliteration of the umbilical arteries in accomplished by 2-3 months
◼ Ductus arterious closure ◼ full term baby: 80% closed within 24 hours after birth , 95％anatomic closure within the first year ◼ Total obliteration of the umbilical arteries in accomplished by 2-3 months Postnatal circulation
Classification of chD 1. left to right shunt-左向右分流型(潜伏紫绀型) VSD、ASD、PDA 2. right to left shunt-右向左分流型(紫绀型) TOF D-TGA ■3. without shunt一无分流型(无紫绀型) PS、AS
◼ 1. left to right shunt －左向右分流型（潜伏紫绀型） VSD、ASD、PDA ◼ 2. right to left shunt －右向左分流型（紫绀型） TOF D-TGA ◼ 3. without shunt －无分流型（无紫绀型） PS、AS Classification of CHD