During a CST, the nurse observes variable decelerations of the FHR with or without contractions.

What does this finding indicate?

Cord compression

Fetal hypoxia

Normal placental function

Adequate fetal oxygenation

Answer and Explanation

The Correct Answer is A

This finding indicates that the umbilical cord is being compressed, which can reduce the blood flow and oxygen supply to the fetus.

Variable decelerations are abrupt decreases in the fetal heart rate (FHR) that vary in shape, duration, and degree of fall below the baseline.

They are seen as W- or U-shaped waves on the monitor.

Choice B is wrong because fetal hypoxia is not indicated by variable decelerations, but by late decelerations, which are gradual decreases in the FHR that begin after the peak of the contraction and return to baseline after the contraction ends.

Late decelerations are associated with uteroplacental insufficiency, which means that the placenta is not delivering enough oxygen to the fetus.

Choice C is wrong because normal placental function is not indicated by variable decelerations, but by reassuring FHR patterns, such as moderate variability (6 to 25 beats per minute) and accelerations (increases in the FHR above the baseline).

Normal placental function ensures adequate fetal oxygenation and well-being.

Choice D is wrong because adequate fetal oxygenation is not indicated by variable decelerations, but by reassuring FHR patterns, such as moderate variability and accelerations.

Adequate fetal oxygenation means that the fetus is not experiencing hypoxia or distress.

Normal ranges for FHR are 110 to 160 beats per minute at term and 120 to 160 beats per minute before term.

Normal ranges for uterine contractions are 2 to 5 contractions in 10 minutes, lasting less than 90 seconds each.

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Correct Answer is B

Explanation

This test can detect genetic disorders.

Chorionic villus sampling (CVS) is a prenatal test that involves taking a sample of tissue from the placenta to test for chromosomal abnormalities and certain other genetic problems.

The placenta is a structure in the uterus that provides blood and nutrients from the mother to the fetus.

Choice A is wrong because CVS does not provide information on neural tube defects, such as spina bifida.

For this reason, women who undergo CVS also need a follow-up blood test between 16 to 18 weeks of their pregnancy to screen for neural tube defects.

Choice C is wrong because CVS can detect chromosomal abnormalities, but not all chromosomal abnormalities are genetic disorders.

For example, Down syndrome is a chromosomal abnormality caused by an extra copy of chromosome 21, but it is not inherited from the parents.

Choice D is wrong because CVS cannot detect Rh sensitization, which is a condition where the mother’s immune system produces antibodies against the fetus’s blood type.

Rh sensitization can be detected by a blood test that measures the level of antibodies in the mother’s blood.

A. Fetal well-being. B. Maternal blood pressure. C. Placental function. D. Amniotic fluid volume.

Correct Answer is A

Explanation

A contraction stress test (CST) is performed near the end of pregnancy to determine how well the fetus will cope with the contractions of childbirth.

The aim is to induce contractions and monitor the fetus to check for heart rate abnormalities using a cardiotocograph.

A normal heartbeat is a good sign that the fetus will be healthy during labor.

Choice B is wrong because a CST does not measure maternal blood pressure.

Choice C is wrong because a CST does not assess placental function directly.

Choice D is wrong because a CST does not measure amniotic fluid volume.

Normal ranges for fetal heart rate are between 110 and 160 beats per minute.

Normal ranges for uterine contractions are between 2 and 5 contractions in 10 minutes, lasting less than 90 seconds each.

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During a CST, the nurse observes variable decelerations of the FHR with or without contractions. What does this finding indicate?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

A nurse is providing education to a client who is scheduled to undergo chorionic villus sampling (CVS). Which statement by the client indicates an understanding of this test?

Correct Answer is B

Explanation

A nurse is explaining the purpose of a Contraction Stress Test (CST) to a pregnant client. What does the CST aim to assess?

Correct Answer is A

Explanation

A nurse is educating a pregnant client about the Contraction Stress Test (CST). Which statement accurately describes a negative CST?

A nurse is caring for a patient who had an amniocentesis performed at 16 weeks gestation and reports cramping and vaginal bleeding 24 hours later. Which action should be taken first?

A nurse is providing education to a client who is scheduled to undergo chorionic villus sampling (CVS). Which statement by the client indicates an understanding of this test?

A nurse is discussing the risks associated with a Contraction Stress Test (CST) with a pregnant client. Which complication should the nurse mention?

A client is scheduled for an abdominal ultrasound in two weeks to assess fetal growth and development during pregnancy. Which of these statements made by the client indicates that further teaching is needed?

A nurse is caring for a client who had chorionic villus sampling (CVS) performed at 12 weeks’ gestation and asks when she can expect results from this test. The nurse should inform her that results are typically available within which timeframe?

A nurse is discussing the factors that can affect Alpha-fetoprotein Test (AFP) results with a pregnant client. Which factor should the nurse mention?

A nurse is caring for a client scheduled for a CST. Which statement indicates the client understands the test procedure?

During a CST, the nurse observes variable decelerations of the FHR with or without contractions.

What does this finding indicate?