The parents are questioning why their newborn was born deaf when there are no other deaf family members.
At which stage of the pregnancy could the nurse explore possible exposure to a teratogenic agent?
18 weeks after fertilization.
6 weeks after fertilization.
12 weeks after fertilization.
Incomplete question/stem.
The Correct Answer is B
“6 weeks after fertilization.” Teratogens can begin affecting the developing embryo as early as 10 to 14 days after conception 1.
During embryonic development, there are periods when the developing organ systems show more sensitivity to teratogens.
Choice A is incorrect because 18 weeks after fertilization is not the earliest stage of pregnancy when exposure to a teratogenic agent could occur.
Choice C is incorrect because 12 weeks after fertilization is not the earliest stage of pregnancy when exposure to a teratogenic agent could occur.
Choice D is incorrect because this is not an incomplete question/stem.
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Related Questions
Correct Answer is C
Explanation
This is an antibiotic ointment that is applied to the eyes of newborns to prevent ophthalmia neonatorum, a serious eye infection caused by gonorrhea.
Ophthalmia neonatorum can cause blindness if left untreated and can occur even if the mother does not have symptoms of gonorrhea.
Erythromycin is the only drug approved by the FDA for this purpose and is mandated in most states.
Choice A.
Nystatin is incorrect, as this is an antifungal medication that is used to treat oral thrush or diaper rash in newborns, not eye infections.
Choice B.
Ceftriaxone is incorrect, as this is an antibiotic injection that is used to treat systemic gonorrhea infections in adults or newborns, not eye infections.
Choice D.
Ofloxacin is incorrect, as this is an antibiotic eye drop that is used to treat bacterial conjunctivitis in older children and adults, not ophthalmia neonatorum in newborns.
Therefore, choice C is the best answer to this question.
Correct Answer is B
Explanation
“Placenta.” The placenta is the structure that provides oxygen and nutrients to the growing fetus and removes waste products from the fetus’s blood.
Choice A is incorrect because the umbilical arteries carry deoxygenated blood and waste products from the fetus to the placenta.
Choice C is incorrect because amniotic fluid provides a cushion for the fetus and helps maintain a constant temperature in the uterus but does not provide nutrition.
Choice D is incorrect because the decidua is the lining of the uterus during pregnancy and does not provide nutrition to the fetus.
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