A client asks the nurse about the interpretation of a negative CST result.
What should the nurse explain to the client?
No late decelerations of the FHR were observed during contractions.
Late decelerations of the FHR were observed with less than 50% of contractions.
Variable decelerations of the FHR were observed with or without contractions.
Late decelerations of the FHR were observed with at least 50% of contractions.
The Correct Answer is 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 is wrong because 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 is wrong because 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 is wrong because 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.
This requires further evaluation and possible intervention.
Normal ranges for FHR are 110 to 160 bpm during late pregnancy and labor. Normal ranges for uterine contractions are 2 to 5 per 10 minutes, lasting less than 90 seconds each.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
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 is wrong because 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 is wrong because 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 is wrong because 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.
Correct Answer is A
Explanation
Late decelerations of the FHR with at least 50% of contractions.This indicates a positive CST, which means that the baby may be under stress and unable to tolerate labor contractions.A positive CST may require a cesarean section or further observation.
Choice B is wrong because late decelerations of the FHR with less than 50% of contractions indicate an equivocal CST, which means that the results are unclear and the test may need to be repeated.
Choice C is wrong because no late decelerations of the FHR during contractions indicate a negative CST, which means that the baby is healthy and can handle the stress of labor.
Choice D is wrong because variable decelerations of the FHR with or without contractions indicate cord compression, not placental insufficiency, which is what the CST is testing for.
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