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 B
Explanation
Choice A rationale
Accidental lacerations are possible during a cesarean delivery, but they are typically managed quickly and are not the most critical issue immediately after birth.
Choice B rationale
Respiratory distress is the priority assessment for a newborn following a cesarean delivery because cesarean births can increase the risk of transient tachypnea or other respiratory complications due to the lack of labor-induced respiratory adaptation.
Choice C rationale
Hypothermia is a concern for all newborns, but respiratory distress takes precedence in the immediate post-delivery period, especially following cesarean delivery.
Choice D rationale
Acrocyanosis is a common and typically benign condition in newborns, not requiring immediate intervention compared to respiratory distress.
Correct Answer is D
Explanation
Choice A rationale
GBS can be transmitted to the baby during both vaginal and cesarean deliveries if the mother is colonized with the bacteria. It is not limited to cesarean sections, hence why appropriate screening and treatment are essential.
Choice B rationale
GBS, although often harmless in the general population, can cause severe infections in newborns. This bacterium can be a source of severe neonatal infections like sepsis, pneumonia, and meningitis, necessitating preventive measures during pregnancy and delivery.
Choice C rationale
Screening for GBS is typically performed between 35 and 37 weeks of gestation, not at the first prenatal visit. This timing ensures accurate detection of the bacteria closer to the time of delivery.
Choice D rationale
Intravenous antibiotics during labor are recommended for mothers who test positive for GBS to prevent transmission to the baby. This intervention significantly reduces the risk of neonatal GBS infection.