Correct Answer: C

Rationale: The primary reason for an ultrasound at 20 weeks gestation is to assess fetal growth, gestational age, and anatomical development. This evaluation helps ensure the fetus is developing appropriately and can detect any potential issues that may require intervention. Choices A, B, and D are incorrect because at 20 weeks, the primary focus of the ultrasound is not to determine the sex of the fetus, detect chromosomal abnormalities, or assess the lecithin-sphingomyelin ratio. While these factors may be evaluated in pregnancy, they are not the primary reasons for an ultrasound at 20 weeks gestation.

Correct Answer: A

Rationale: The best nursing intervention for a pregnant woman with hyperemesis gravidarum is to administer the prescribed IV solution. Hyperemesis gravidarum is a severe form of nausea and vomiting during pregnancy that can lead to dehydration and electrolyte imbalances. Administering IV fluids helps in managing dehydration, replenishing electrolytes, and providing the necessary hydration for both the mother and the fetus. Giving oral rehydration solution (Choice B) may not be sufficient for severe cases of hyperemesis gravidarum where IV fluids are required. Encouraging small, frequent meals (Choice C) may not be effective as the woman may not be able to tolerate oral intake. Offering ginger tea (Choice D) is not the most appropriate intervention for hyperemesis gravidarum, as it may not provide adequate hydration or electrolyte balance needed in severe cases.

Correct Answer: C

Rationale: The color and consistency of the amniotic fluid are crucial to assess as they can provide valuable information about the presence of meconium, which may indicate fetal distress. Meconium-stained amniotic fluid can lead to complications such as meconium aspiration syndrome in the newborn. Therefore, assessing the color and consistency of the amniotic fluid is the priority in this situation to ensure timely interventions if needed. Estimated amount of fluid (Choice A) may be important but not as critical as assessing for meconium. Any odor noted when membranes ruptured (Choice B) is less relevant compared to assessing for meconium. Knowing the time the membranes ruptured (Choice D) is important but does not take precedence over assessing for fetal distress indicated by meconium presence.

Correct Answer: A

Rationale: To calculate the infusion rate in mL/hour, first, convert 2 milliunits/minute to milliunits/hour by multiplying by 60 to get 120 milliunits/hour. Then, calculate the mL/hour using the formula: milliunits/hour (120) total volume (1000 mL) · units in IV solution (10 units) = 1200 mL/hour. Therefore, the nurse should program the infusion pump to deliver 12 mL/hour to provide the prescribed dose of oxytocin. Choice B is incorrect as it does not reflect the correct calculation. Choice C is incorrect as it is not derived from the correct formula. Choice D is incorrect as it is not the result of the accurate calculation based on the provided information.

Correct Answer: D

Rationale: In the scenario presented, the client is exhibiting signs and symptoms of severe preeclampsia, including hypertension, proteinuria, facial and hand swelling, visual disturbances, and a severe headache. The medication of choice for preventing seizures in preeclampsia is magnesium sulfate. This drug helps to prevent and control seizures in clients with preeclampsia, making it the most appropriate option for this client. Clonidine hydrochloride (Choice A) is an antihypertensive medication used for managing hypertension but is not the first-line treatment for preeclampsia. Carbamazepine (Choice B) is an anticonvulsant used for seizure disorders like epilepsy and is not indicated for preeclampsia. Furosemide (Choice C) is a diuretic used to manage fluid retention but is not the drug of choice for treating preeclampsia.