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EXPLANATION
✔Correct answer:
In fetal circulation, the lungs are non-functional, and most of the blood is mixed. In fetal circulation, the lungs are non-functional, and most of the blood bypasses the lungs, as the fetus receives oxygenated blood through the placenta rather than through pulmonary respiration. Because the lungs are not used for gas exchange, fetal circulation includes shunts that allow blood to bypass the lungs, including the foramen ovale (a hole between the right and left atria) and the ductus arteriosus (a vessel connecting the pulmonary artery to the aorta). These adaptations ensure that the fetus receives oxygen-rich blood from the placenta, with much of the blood in the fetal circulation being mixed (i.e., containing both oxygenated and deoxygenated blood).
After birth, the newborn takes its first breath, which causes the lungs to expand, decreasing pulmonary vascular resistance and allowing blood to flow through the lungs for oxygenation. This shift in circulation closes the fetal shunts (foramen ovale and ductus arteriosus) over time, leading to separate oxygenated and deoxygenated blood flow in the neonatal heart. In fetal circulation, however, the placenta provides oxygen, and the fetus relies on the shunts to bypass the lungs, resulting in mixed blood.
Think of fetal circulation like a road system where some roads (shunts) bypass the main city (lungs), because the main oxygen supply is coming from outside the city (the placenta). After birth, those bypass roads are closed, and traffic flows through the main city, where oxygen is now supplied directly through the lungs.
When educating parents about neonatal circulation, Nurse Jenna should explain how the circulatory changes after birth support the newborn's independent respiratory function and provide oxygenation without the need for placental support.
- Educate parents about the changes in the baby's circulation after birth, including the closure of the fetal shunts as the newborn adapts to breathing on its own.
- Reassure parents that transient heart murmurs in newborns are often due to the normal closure of the fetal shunts and typically resolve within a few days to weeks.
- Monitor the newborn for any signs of respiratory distress or circulatory issues, which could indicate that one of the fetal shunts has not closed properly (e.g., patent ductus arteriosus).
- Explain that these changes in circulation are part of the natural adaptation process from fetal life to neonatal life.
✘Incorrect answer options:
In fetal circulation, blood in the left atrium is shunted to the right atrium to direct it towards the lungs. This is incorrect because in fetal circulation, the foramen ovale allows blood to flow from the right atrium to the left atrium, bypassing the lungs, as they are non-functional in utero.
In fetal circulation, the left side of the heart has oxygenated blood, while the right side has unoxygenated blood. This is incorrect because, in fetal circulation, there is significant mixing of oxygenated and deoxygenated blood, and both sides of the heart contain mixed blood. The fetus receives oxygen from the placenta, and fetal shunts allow the blood to bypass the lungs, resulting in mixed blood throughout the fetal circulatory system.
None of the choices. This answer is incorrect, as option A accurately describes a key difference between fetal and neonatal circulation.
References
- McKinney, E. S., James, S. R., Murray, S. S., & Ashwill, J. W. (2017). Maternal-Child Nursing. Elsevier.
- Davidson, M. R., London, M. L., & Ladewig, P. A. (2016). Olds' Maternal-Newborn Nursing & Women's Health Across the Lifespan. Pearson.