Review Contraction Stress Test (CST)

Prenatal Diagnostic Tests And Procedures > Maternal & Newborn

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Contraction Stress Test (CST)

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Total Questions : 5

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Question 1:

A nurse is explaining the Contraction Stress Test (CST) to a pregnant client.

Which statement accurately describes a positive CST?

Answer and Explanation

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Question 2:

A client is scheduled for a Contraction Stress Test (CST).

When should the CST be performed?

Answer and Explanation

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Question 3:

A nurse is preparing a pregnant client for a Contraction Stress Test (CST).

What is the purpose of inducing uterine contractions during the test?

A. To assess fetal well-being. B. To monitor the FHR. C. To achieve at least three contractions lasting 40 to 60 seconds. D. To identify fetal hypoxia or distress.

Answer and Explanation

Choice A:

The purpose of inducing uterine contractions during the test is to simulate labor contractions and check how the baby’s heart rate reacts to the stress of reduced blood and oxygen supply. A normal heart rate indicates that the baby will be healthy during labor.

Choice B:

Monitoring the FHR is not the purpose of the test, but a means to assess fetal well-being.

Choice C:

Achieving at least three contractions lasting 40 to 60 seconds is not the purpose of the test, but a criterion for a satisfactory test.

Choice D:

Identifying fetal hypoxia or distress is not the purpose of the test, but a possible outcome of an abnormal test.

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Question 4:

A client asks the nurse about the interpretation of a negative CST result.

What should the nurse explain to the client?

A. No late decelerations of the FHR were observed during contractions. B. Late decelerations of the FHR were observed with less than 50% of contractions. C. Variable decelerations of the FHR were observed with or without contractions. D. Late decelerations of the FHR were observed with at least 50% of contractions.

Answer and Explanation

Choice A:

This means that the fetus is well oxygenated and tolerating labor well. A negative CST result is reassuring and has a high negative predictive value.

Choice B:

Late decelerations of the FHR are a sign of fetal hypoxia and placental insufficiency. They occur after the peak of a contraction and are associated with fetal distress.

Choice C:

Variable decelerations of the FHR are caused by cord compression and can occur with or without contractions. They are abrupt decreases in FHR that vary in onset, depth, and duration. They may indicate fetal compromise if they are severe or persistent.

Choice D:

Late decelerations of the FHR with at least 50% of contractions indicate a positive CST result, which means that the fetus is at risk of hypoxia and acidosis.

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Question 5:

During a CST, the nurse notices late decelerations of the FHR with at least 50% of contractions.

How should the nurse interpret this finding?

A. Positive CST result indicating fetal hypoxia and compromised placental function. B. Negative CST result indicating adequate fetal oxygenation and normal placental function. C. Equivocal CST result indicating cord compression, fetal head compression, or mild fetal hypoxia. D. Unsatisfactory CST result requiring repeating the test or performing a BPP.

Answer and Explanation

Choice A:

Late decelerations of the FHR are a sign of uteroplacental insufficiency, meaning that the placenta is not delivering enough oxygen to the fetus. This can lead to fetal distress and hypoxia. A positive CST result means that there is evidence of fetal compromise during uterine contractions.

Choice B:

A negative CST result would mean that there are no late decelerations or significant variable decelerations of the FHR with at least three contractions in 10 minutes. This would indicate adequate fetal oxygenation and normal placental function.

Choice C:

An equivocal CST result would mean that there are either variable decelerations of the FHR with more than 50% of contractions, or late decelerations with less than 50% of contractions. This could indicate cord compression, fetal head compression, or mild fetal hypoxia.

Choice D:

An unsatisfactory CST result would mean that there are either no contractions in 10 minutes, or less than three contractions in 10 minutes with an uninterpretable FHR tracing. This would require repeating the test or performing a biophysical profile (BPP) to assess fetal well-being.

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Contraction Stress Test (CST)

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