Create 1 slide for this topic: 1. Normal Fetal Circulation The ductus arteriosus connects the pulmonary artery to the descending aorta. During fetal life: Allows deoxygenated blood returning to the right heart to bypass the lungs and return to the placenta for reoxygenation. Essential for normal fetal circulation. After birth: Normally undergoes constriction → closure → formation of a fibrous remnant. PDA occurs when the ductus arteriosus fails to close after birth.
Create 1 slide for this topic: 1. Normal Fetal Circulation
The ductus arteriosus connects the pulmonary artery to the descending aorta.
During fetal life:
Allows deoxygenated blood returning to the right heart to bypass the lungs and return to the placenta for reoxygenation.
Essential for normal fetal circulation.
After birth:
Normally undergoes constriction → closure → formation of a fibrous remnant.
PDA occurs when the ductus arteriosus fails to close after birth.
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Normal fetal circulation involves the ductus arteriosus connecting the pulmonary artery to the descending aorta, allowing right-heart blood to bypass the lungs and return to the placenta for reoxygenation. After birth, lung expansion redirects blood into pulmonary circulation, leading to the physiological closure of the ductus. If this closure fails, as seen in patent ductus arteriosus (PDA), it can result in abnormal shunting and lung overload, highlighting the importance of closure for...