During a CST, the nurse notices late decelerations of the FHR with at least 50% of contractions.
How should the nurse interpret this finding?
Positive CST result indicating fetal hypoxia and compromised placental function.
Negative CST result indicating adequate fetal oxygenation and normal placental function.
Equivocal CST result indicating cord compression, fetal head compression, or mild fetal hypoxia.
Unsatisfactory CST result requiring repeating the test or performing a BPP.
The Correct Answer is 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 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.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A contraction stress test (CST) is performed near the end of pregnancy (34 weeks’ gestation) to determine how well the fetus will cope with the contractions of childbirth.The test triggers contractions and monitors the fetal heart rate using a cardiotocograph.A normal heartbeat is a good sign that the fetus will be healthy during labor.
Choice A is wrong because a CST is usually done after 32 weeks of gestation, not before 28 weeks.Doing the test too early may not be safe for the fetus.
Choice C is wrong because a CST is not only done for clients with diabetes mellitus.It may be done for clients who have complications during their pregnancy or who have abnormal results from other tests, such as a nonstress test or a biophysical profile.
Choice D is wrong because a CST is not only done for clients with hypertension.It may be done for clients who have complications during their pregnancy or who have abnormal results from other tests, such as a nonstress test or a biophysical profile.
Correct Answer is A
Explanation
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 is wrong because monitoring the FHR is not the purpose of the test, but a means to assess fetal well-being.
Choice C is wrong because 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 is wrong because identifying fetal hypoxia or distress is not the purpose of the test, but a possible outcome of an abnormal test.
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