Nokea
Why might a provider recommend percutaneous umbilical blood sampling? Select all that apply.
- A. an increased risk of Down syndrome shown on a previous scan
- B. to detect Down syndrome in the fetus, as this test provides the most accurate screening
- C. to check for genetic and chromosomal abnormalities the fetus is at high risk for
- D. to verify the blood type of the fetus
Correct Answer: B
Rationale: Percutaneous umbilical blood sampling is recommended to detect Down syndrome accurately by analyzing fetal blood. This is because it directly tests the fetal blood for chromosomal abnormalities like Down syndrome, providing a definitive diagnosis. Other choices are incorrect because A does not specify the need for a direct blood test, C is too general, and D can be determined using other non-invasive methods like amniocentesis.
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With regard to the development of the respiratory system, maternity nurses should understand that:
- A. The respiratory system does not begin developing until after the embryonic stage.
- B. The infant's lungs are considered mature when the lecithin/sphingomyelin [L/S] ratio is 1:1, at about 32 weeks.
- C. Maternal hypertension can reduce maternal-placental blood flow, accelerating lung maturity.
- D. Fetal respiratory movements are not visible on ultrasound scans until at least 16 weeks.
Correct Answer: C
Rationale: A reduction in placental blood flow stresses the fetus, increases blood levels of corticosteroids, and accelerates lung maturity.
A woman's cousin gave birth to an infant with a congenital heart anomaly. The woman asks the nurse when such anomalies occur during development. Which response by the nurse is most accurate?
- A. We don't really know when such defects occur.
- B. It depends on what caused the defect.
- C. They occur between the third and fifth weeks of development.
- D. They usually occur in the first 2 weeks of development.
Correct Answer: C
Rationale: The cardiovascular system is the first organ system to function in the developing human. Blood vessel and blood formation begins in the third week, and the heart is developmentally complete in the fifth week.
What karyotype would the nurse anticipate for a patient with Klinefelter’s syndrome?
- A. XO
- B. XXY
- C. XYY
- D. XXX
Correct Answer: B
Rationale: The correct answer is B: XXY. In Klinefelter's syndrome, individuals have an extra X chromosome, resulting in a karyotype of 47,XXY. This leads to physical and cognitive characteristics associated with the syndrome. Choice A (XO) represents Turner syndrome, which involves a missing X chromosome. Choices C (XYY) and D (XXX) are not associated with Klinefelter's syndrome as they involve extra Y and X chromosomes respectively, leading to different syndromes altogether.
A woman asks the nurse, 'What protects my baby's umbilical cord from being squashed while the baby's inside of me?' The nurse's best response is:
- A. Your baby's umbilical cord is surrounded by connective tissue called Wharton jelly, which prevents compression of the blood vessels and ensures continued nourishment of your baby.
- B. Your baby's umbilical floats around in blood anyway.
- C. You don't need to worry about things like that.
- D. The umbilical cord is a group of blood vessels that are very well protected by the placenta.
Correct Answer: A
Rationale: Wharton jelly surrounds the umbilical cord and prevents compression of the blood vessels.
A male patient is diagnosed with low sperm count as the cause of infertility. Which interventions will the nurse recommend to improve the patient’s sperm count? Select all that apply.
- A. Yoga or relaxation techniques
- B. Surgical repair of an inguinal hernia
- C. Switch to underwear made from cotton
- D. Avoidance of showers with hot water temperature
Correct Answer: A
Rationale: The correct answer is A: Yoga or relaxation techniques. Stress can negatively impact sperm count, so relaxation techniques like yoga can help reduce stress levels and improve sperm count. Surgical repair of an inguinal hernia (Choice B) is unrelated to sperm count. Switching to cotton underwear (Choice C) may help with ventilation, but it does not directly impact sperm count. Avoiding hot showers (Choice D) can prevent overheating of the testicles, but it is not as effective as stress reduction techniques in improving sperm count.