A nurse is teaching a newly licensed nurse about the uses of ultrasonography in the first trimester of pregnancy. Which of the following statements by the newly licensed nurse indicates an understanding of the teaching?
"Ultrasound is used to observe for placental maturity in the first trimester."
"Ultrasound is used to detect intrauterine growth restriction in the first trimester."
"Ultrasound is used to determine gestational age in the first trimester."
"Ultrasound is used to perform a biophysical profile in the first trimester."
The Correct Answer is C
Ultrasonography is a diagnostic imaging technique that uses high-frequency sound waves to create images of the internal structures of the body. It is a safe and noninvasive method that can provide valuable information about the pregnancy, such as the number, size, location, and health of the fetus(es), the placenta, the amniotic fluid, and the uterus.
Ultrasonography can be performed at any time during pregnancy, but it is especially useful in the first trimester (the first 12 weeks of pregnancy) for several reasons, such as:
- To confirm the pregnancy and rule out ectopic pregnancy (a pregnancy that occurs outside the uterus) or molar pregnancy (a pregnancy that develops into an abnormal mass of tissue)
- To determine gestational age (the length of time since the first day of the last menstrual period) and estimate due date (the expected date of delivery)
- To screen for chromosomal abnormalities (such as Down syndrome) or structural defects (such as spina bifida) in the fetus
- To identify multiple gestations (such as twins or triplets) or complications (such as miscarriage or
bleeding)
One of the main uses of ultrasonography in the first trimester is to determine gestational age. This is important because it can affect many aspects of prenatal care and delivery, such as:
- The timing and accuracy of other tests and procedures
- The monitoring and evaluation of fetal growth and development
- The identification and management of potential problems or complications
- The planning and preparation for labor and delivery
Gestational age can be determined by measuring the crown-rump length (CRL) of the fetus, which is the distance from the top of the head to the bottom of the spine. The CRL can be measured by using a transvaginal ultrasound (an ultrasound probe that is inserted into the vagina) or a transabdominal ultrasound (an ultrasound probe that is moved over the abdomen). The CRL can be compared to a standard growth chart to estimate gestational age. The CRL measurement is most accurate between 7 and 13 weeks of pregnancy .
Therefore, the newly licensed nurse who says that ultrasound is used to determine gestational age in the first trimester indicates an understanding of the teaching.
The other statements show a lack of knowledge or misunderstanding of the uses of ultrasonography in the first trimester:
- a) "Ultrasound is used to observe for placental maturity in the first trimester." This is not correct because placental maturity is not assessed in the first trimester. Placental maturity refers to the changes that occur in the placenta as it ages and prepares for delivery. Placental maturity can be evaluated by using a grading system that ranges from 0 to 3, based on the appearance of calcifications (deposits of calcium) in the placenta. Placental maturity can be assessed by using a transabdominal ultrasound in the third trimester (after 28 weeks of pregnancy).
- b) "Ultrasound is used to detect intrauterine growth restriction in the first trimester." This is not correct because intrauterine growth restriction (IUGR) is not detected in the first trimester. IUGR is a condition in which the fetus does not grow as expected and has a low birth weight for its gestational age. IUGR can be caused by various factors, such as placental insufficiency, maternal malnutrition, infection, or chronic disease. IUGR can affect fetal development and increase the risk of complications, such as hypoxia, hypoglycemia, or stillbirth. IUGR can be diagnosed by measuring fetal growth parameters, such as abdominal circumference, head circumference, femur length, and estimated fetal weight. These measurements can be obtained by using a transabdominal ultrasound in the second or third trimester (after 20 weeks of pregnancy).
- d) "Ultrasound is used to perform a biophysical profile in the first trimester." This is not correct because a biophysical profile (BPP) is not performed in the first trimester. A BPP is a test that evaluates fetal well-being by assessing five parameters: fetal movement, fetal tone, fetal breathing, amniotic fluid volume, and fetal heart rate. A BPP can help detect fetal distress or hypoxia and guide management decisions. A BPP can be performed by using a combination of transabdominal ultrasound and nonstress test (NST) in the third trimester (after 32 weeks of pregnancy).
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
The correct answer is choice B. Single palmar creases.
Choice A rationale:
Rust-stained urine is typically due to urate crystals and is common in newborns. It usually resolves on its own and is not a cause for concern.
Choice B rationale:
Single palmar creases can be associated with certain genetic conditions, such as Down syndrome. This finding should be reported to the provider for further evaluation.
Choice C rationale:
Subconjunctival hemorrhage is a common finding in newborns due to the pressure changes during delivery. It usually resolves without intervention and is not typically a cause for concern.
Choice D rationale:
Transient circumoral cyanosis is often seen in newborns and can occur when the baby is crying or feeding. It usually resolves on its own and is not typically a cause for concern.
Correct Answer is D
Explanation
Phototherapy is a treatment that uses light to lower the level of bilirubin in the blood of newborns who have jaundice. Jaundice is a condition that causes yellowing of the skin and eyes due to high levels of bilirubin, a waste product that is normally removed by the liver. Phototherapy helps the body break down and eliminate bilirubin through urine and stool¹.
Phototherapy can be done at home or in the hospital, depending on the severity of jaundice and the type of light used. The most common types of light are fluorescent lamps, halogen lamps, or light-emitting diodes (LEDs). The light can be delivered through overhead units, fiber-optic blankets, or fiber-optic pads. The light should cover as much of the newborn's skin as possible, except for the eyes and genitals¹².
The nurse should follow certain guidelines when caring for a newborn who is receiving phototherapy, such
as:
- Monitor the newborn's temperature, hydration, weight, and urine and stool output regularly
- Protect the newborn's eyes with eye patches or goggles to prevent eye damage
- Turn the newborn every 2 to 4 hours to expose different parts of the body to the light
- Feed the newborn frequently to prevent dehydration and promote bilirubin excretion
- Check the newborn's skin color and bilirubin level periodically to evaluate the effectiveness of
phototherapy
- Provide emotional support and education to the parents about jaundice and phototherapy
One of the important guidelines is to avoid using lotion or ointment on the newborn's skin during phototherapy. This is because lotion or ointment can block the light from reaching the skin and reduce the effectiveness of phototherapy. Lotion or ointment can also cause skin irritation, rash, or burns if they react with the light. The newborn's skin should be clean and dry before phototherapy¹²³.
The other options are not actions that the nurse should include in the plan of care:
- a) Keep the newborn supine throughout treatment. This is not correct because keeping the newborn in one position can limit the exposure of different parts of the body to the light and reduce the effectiveness of phototherapy. The nurse should turn the newborn every 2 to 4 hours to expose different parts of the body to the light¹².
- b) Dress the newborn in lightweight clothing. This is not correct because dressing the newborn in clothing can block the light from reaching the skin and reduce the effectiveness of phototherapy. The newborn should be undressed except for a diaper during phototherapy¹².
- c) Measure the newborn's temperature every 8 hours. This is not correct because measuring the newborn's temperature every 8 hours may not be frequent enough to detect any changes in temperature that may occur during phototherapy. Phototherapy can cause overheating or hypothermia in newborns, depending on the type and intensity of light used. The nurse should monitor the newborn's temperature more often, such as every 2 to 4 hours, and adjust the room temperature or use blankets as needed¹².
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