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
A family history of breast cancer, particularly in a close relative like a sister, is a significant risk factor for breast cancer.
Choice B rationale
Exposure to radiation, particularly in the chest area, increases the risk of developing breast cancer.
Choice C rationale
Current use of oral contraceptives can slightly increase the risk of breast cancer, though the risk diminishes after stopping the pills.
Choice D rationale
Age less than 25 years is not a risk factor for breast cancer; risk increases with age.
Correct Answer is C
Explanation
Choice A rationale
Category 1 is a normal fetal heart rate pattern with no signs of fetal distress, which is not applicable in this case.
Choice B rationale
Category 2 represents an intermediate category with some concerns, but recurrent late decelerations and absent variability place this scenario in a higher risk category.
Choice C rationale
Category 3 indicates abnormal fetal heart rate patterns, including absent variability with recurrent late decelerations, which is associated with potential fetal hypoxia or acidemia and requires prompt intervention.
Choice D rationale
There is no Category 4 in fetal heart rate monitoring.