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A nurse is educating a client about a contraction stress test.

Which of the following is correct regarding the contraction stress test?

A.

We are looking for a negative result.

B.

We are looking for three contractions in a 10-minute period with moderate variability and no decelerations.

C.

A negative result indicates fetal well-being.

D.

A positive result indicates fetal growth restriction, lower Apgar scores, and need for cesarean delivery.

Answer and Explanation

The Correct Answer is C

Choice A rationale

 

While a negative result in a Contraction Stress Test (CST) is desirable, this choice does not fully explain the significance of the result. A negative CST indicates that there are no late decelerations in the fetal heart rate in response to uterine contractions, suggesting that the fetus can handle the stress of labor.

 

Choice B rationale

 

This choice describes the criteria for a reactive Nonstress Test (NST), not a Contraction Stress Test (CST). In a CST, the focus is on the fetal heart rate response to contractions, not the number of contractions or variability.

 

Choice C rationale

 

A negative result in a CST indicates fetal well-being, meaning that the fetus can tolerate the stress of uterine contractions without showing signs of distress, such as late decelerations in the heart rate. This result suggests that the fetus is likely to handle labor well.

 

Choice D rationale

 

A positive result in a CST indicates that the fetus has late decelerations in response to contractions, which can be a sign of fetal distress. This result may suggest fetal growth restriction, lower Apgar scores, and the potential need for cesarean delivery. However, this choice does not fully capture the significance of a positive CST result.


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Correct Answer is A

Explanation

Choice A rationale

Late decelerations are a sign of uteroplacental insufficiency and fetal hypoxia. They occur after the peak of a contraction and indicate that the fetus is not receiving enough oxygen. This requires immediate intervention to improve fetal oxygenation and prevent fetal distress.

Choice B rationale

Variability in fetal heart rate of 12 bpm is considered moderate variability, which is a reassuring sign of fetal well-being. It indicates that the fetus has a healthy autonomic nervous system and is not in distress.

Choice C rationale

Accelerations in fetal heart rate are also a reassuring sign. They indicate that the fetus is well-oxygenated and responding appropriately to stimuli. No intervention is needed for accelerations.

Choice D rationale

A baseline fetal heart rate of 140 bpm is within the normal range (110-160 bpm) and does not indicate any immediate concern. It is a sign of a healthy, well-oxygenated fetus.

Correct Answer is A

Explanation

Choice A rationale

A reactive non-stress test (NST) indicates that the fetal heart rate increases appropriately with fetal movements, suggesting good fetal oxygenation and neurological function. This is the desired outcome for an NST4.

Choice B rationale

A non-reactive NST means the fetal heart rate did not increase with movements, which could indicate fetal hypoxia or other issues. Further testing would be needed to assess fetal well-being.

Choice C rationale

An inconclusive NST means the test did not provide enough information to determine fetal well-being, possibly due to fetal sleep cycles or maternal factors. Additional testing would be required.

Choice D rationale

A positive NST is not a standard term used in fetal monitoring. The correct terms are reactive or non-reactive.

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