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
Pelvic pain and fatigue can be indicators of endometritis, an infection of the uterine lining. It often manifests with pain, fever, and general malaise, and requires further evaluation and intervention.
Choice B rationale
Light amount of dark red lochia with a bloody odor is a normal postpartum finding. Lochia progresses through different stages, and dark red lochia, which occurs in the later stages, typically has a bloody odor.
Choice C rationale
Hematuria, or the presence of blood in the urine, is not a typical symptom of endometritis. It may indicate a urinary tract infection or other renal issues instead.
Choice D rationale
A localized area of breast tenderness may indicate mastitis, an infection of the breast tissue. It is not related to endometritis but requires attention and treatment.
Correct Answer is B
Explanation
Choice A rationale
Uteroplacental insufficiency typically results in late decelerations, not a sudden drop in fetal heart rate, which is more commonly caused by umbilical cord compression.
Choice B rationale
Umbilical cord compression can cause variable decelerations, which are characterized by a sudden drop in fetal heart rate. This occurs due to the umbilical cord being compressed,
leading to decreased blood flow and oxygen to the fetus.
Choice C rationale
Maternal bradycardia refers to a slow maternal heart rate and does not directly cause changes in the fetal heart rate pattern.
Choice D rationale
Fetal head compression typically causes early decelerations, which are gradual decreases in fetal heart rate that occur with contractions and are usually benign.