During preconception counseling, the nurse explains that during the first 8 weeks the fetus is most vulnerable to the effects of teratogens.
What is occurring during the first 8 weeks of gestation?
Placenta formation.
Fertilization.
Organogenesis.
Implantation.
The Correct Answer is C
Choice A rationale
Placenta formation begins shortly after implantation, but it continues to develop throughout the first trimester and into the early second trimester, making it less precise to attribute the
first 8 weeks solely to this process.
Choice B rationale
Fertilization occurs within the first week after ovulation, marking the beginning of pregnancy, but it is a singular event that happens prior to the developmental processes vulnerable to teratogens.
Choice C rationale
Organogenesis is the critical period during which the major organs and structures of the fetus form, typically occurring between the third and eighth weeks of gestation. This is the
time when the fetus is most susceptible to the effects of teratogens, which can cause congenital anomalies.
Choice D rationale
Implantation occurs approximately 6-10 days after fertilization, embedding the blastocyst into the uterine lining. While crucial, it is not the primary period when teratogenic effects are
most significant, as this happens during organogenesis.
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Correct Answer is D
Explanation
Choice A rationale
Blue coloring of the hands and feet in an 8-hour-old newborn (acrocyanosis) is a common, benign finding as the newborn’s circulatory system adjusts post-birth. It does not require immediate intervention.
Choice B rationale
Small raised pearly spots on the nose (milia) are harmless and common in newborns. They do not necessitate any intervention.
Choice C rationale
An apical heart rate of 140 bpm is within the normal range for newborns and does not require intervention.
Choice D rationale
Nasal flaring and grunting are signs of respiratory distress in a newborn. This condition demands immediate intervention to ensure the newborn’s airway is clear and breathing is adequately supported.
Correct Answer is A
Explanation
Choice A rationale
A newborn who is 26 hours post-delivery and has had no urine output needs immediate attention. Lack of urine output for over 24 hours may indicate dehydration or renal issues. Immediate medical evaluation is required to identify underlying conditions and prevent complications such as acute kidney injury or sepsis.
Choice B rationale
Acrocyanosis, characterized by blueish discoloration of the extremities, is common in newborns during the first 24-48 hours of life and usually resolves on its own. It occurs due to immature blood circulation and is generally not a cause for concern.
Choice C rationale
Failure to pass meconium within the first 24 hours can be a sign of conditions like Hirschsprung's disease or cystic fibrosis, but it is not as immediately concerning as anuria (no urine output). Monitoring and further evaluation are necessary, but it does not require urgent provider notification.
Choice D rationale
A blood glucose level of 50 mg/dL in a newborn is within the lower limit of normal. While it's important to monitor, it does not necessitate immediate provider notification unless it continues to drop or other symptoms arise.