Susceptibility to teratogenic agents is most dependent on which of the following factors?
The type of teratogen and the mother's age.
The duration of pregnancy and the mother's health condition.
The amount of teratogen exposure and the father's genetic history.
The timing of exposure and the developmental stage of the embryo or fetus.
The Correct Answer is D
Choice A rationale
While the type of teratogen and the mother's age can influence the outcome, the most critical factor is the timing of exposure. Different teratogens can have varying effects, and maternal age can impact a woman's health, but these are secondary to the primary factor of developmental stage.
Choice B rationale
The duration of pregnancy and the mother's health condition can affect the overall health of the pregnancy, but they are not the primary determinants of teratogenic susceptibility. The timing of exposure is the key factor because specific organ systems are most vulnerable to damage during their periods of rapid differentiation and formation, which occurs at specific times during gestation.
Choice C rationale
The amount of teratogen exposure, or dosage, is a significant factor in the degree of harm, as is the father’s genetic history, which can contribute to congenital anomalies. However, the most crucial variable for determining which organ systems are affected is when the exposure occurred in relation to the embryo's or fetus's developmental stage.
Choice D rationale
The timing of exposure is the most critical factor because different organs and systems are forming at different times during gestation. The period of major organogenesis (approximately weeks 3 to 8) is the most susceptible to major malformations because the cells are rapidly dividing and differentiating. Exposure during this time can lead to significant structural defects in the developing embryo.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["A","C","E","G"]
Explanation
Choice A rationale
This statement is correct. Keeping a daily log of fluid intake, weight, and episodes of nausea/vomiting helps the healthcare provider monitor the severity of hyperemesis gravidarum and assess the effectiveness of interventions. Monitoring weight is essential because a weight loss of more than 5% of pre-pregnancy weight is a criterion for diagnosis.
Choice B rationale
This is an incorrect statement. Drinking large amounts of fluid after meals can worsen nausea and vomiting. It is recommended to drink small amounts of fluid between meals to avoid distending the stomach, which can trigger emesis. Small, frequent sips of fluid are better tolerated and promote hydration without causing nausea.
Choice C rationale
This statement is correct. Ginger and peppermint are known for their antiemetic properties. Ginger, in forms such as ginger ale or candies, can help alleviate nausea by promoting gastric motility and reducing smooth muscle contractions in the stomach. Peppermint has a calming effect on the stomach muscles, which can also help relieve feelings of nausea.
Choice D rationale
This statement is incorrect. Signs of severe dehydration include decreased blood pressure and increased pulse, not the other way around. Dehydration leads to a decrease in blood volume, which causes a compensatory increase in heart rate (pulse) to maintain cardiac output. The blood pressure decreases as a result of hypovolemia.
Choice E rationale
This statement is incorrect. Spicy foods can irritate the gastrointestinal tract and are often poorly tolerated by individuals with hyperemesis gravidarum. They can increase gastric acid production and cause stomach upset, which can exacerbate nausea and vomiting. Bland, low-fat foods are generally recommended as they are easier to digest.
Choice F rationale
This statement is correct. Eating small, frequent meals throughout the day can help prevent an empty stomach, which can often trigger nausea. It also ensures a continuous supply of nutrients to the body, which is crucial for the health of both the mother and the fetus. It also prevents stomach overdistension, which could cause nausea.
Choice G rationale
This statement is correct. Large meals can lead to stomach distension, which can trigger nausea and vomiting. Caffeine and fatty foods can also be difficult to digest and may irritate the stomach, worsening symptoms of hyperemesis gravidarum. It is recommended to eat bland, low-fat, and easily digestible foods instead
Correct Answer is B
Explanation
Choice A rationale
Intrauterine growth restriction (IUGR) is a condition where the fetus is smaller than normal, and it is more commonly associated with oligohydramnios, which is an insufficient amount of amniotic fluid. This occurs because the fetus may not be producing enough urine, which is the primary contributor to amniotic fluid after the first trimester.
Choice B rationale
Maternal diabetes mellitus is a common cause of polyhydramnios. Poorly controlled maternal hyperglycemia can lead to fetal hyperglycemia. This, in turn, causes fetal polyuria, or excessive urination, which significantly increases the volume of amniotic fluid. This is due to the osmotic effect of elevated glucose levels in the fetal circulation.
Choice C rationale
Dehydration in the mother is more likely to cause oligohydramnios, not polyhydramnios. When the mother is dehydrated, her blood volume and subsequent placental blood flow may be reduced, which can affect the production of amniotic fluid. This is in contrast to polyhydramnios, which is an excess of amniotic fluid.
Choice D rationale
Chronic hypertension is more typically associated with conditions that can lead to placental insufficiency and oligohydramnios. Poor placental perfusion resulting from hypertension can compromise fetal growth and reduce fetal urinary output, thereby leading to decreased amniotic fluid volume, which is the opposite of polyhydramnios
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