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 A
Explanation
Choice A rationale
Anaphylactoid syndrome of pregnancy (also known as amniotic fluid embolism) occurs when amniotic fluid, fetal cells, hair, or other debris enter the mother's bloodstream, triggering
a serious reaction. It can cause sudden shortness of breath, cardiovascular collapse, and other severe symptoms immediately after a rupture of membranes and is a rare but critical
obstetrical emergency.
Choice B rationale
Abruptio placentae involves the premature separation of the placenta from the uterine wall, which leads to bleeding and potential fetal and maternal distress. However, it does not
typically present with sudden cardiorespiratory collapse or shortness of breath immediately following membrane rupture.
Choice C rationale
Uterine rupture refers to a tear in the wall of the uterus, usually due to trauma, labor stress, or previous surgical scars. While it is a severe condition, it usually presents with
abdominal pain, vaginal bleeding, and fetal distress rather than sudden respiratory failure.
Choice D rationale
Disseminated intravascular coagulation (DIC) is a condition affecting blood clotting processes, often secondary to other conditions like severe preeclampsia, sepsis, or trauma. It
generally presents with bleeding and clotting issues but not sudden respiratory or cardiovascular collapse.
Correct Answer is B
Explanation
Choice A rationale
Umbilical cord compression typically results in variable decelerations in the fetal heart rate, not moderate variability or regular accelerations. It can lead to changes in fetal heart rate
patterns, but not regular mild contractions.
Choice B rationale
Dysfunctional labor refers to an abnormal labor pattern, including irregular uterine contractions. The described symptoms fit this condition, as they can cause mild pain and be
managed by ambulation, showers, and rest.
Choice C rationale
Chorioamnionitis is an infection of the fetal membranes and amniotic fluid, leading to fever, uterine tenderness, and foul-smelling amniotic fluid, not mild contractions and moderate
variability in FHR.
Choice D rationale
Iron deficiency anemia in pregnancy can cause fatigue, pallor, and shortness of breath but does not affect uterine contractions or fetal heart rate.