A nurse is preparing a pregnant client for a Contraction Stress Test (CST).
What is the purpose of inducing uterine contractions during the test?
To assess fetal well-being.
To monitor the FHR.
To achieve at least three contractions lasting 40 to 60 seconds.
To identify fetal hypoxia or distress.
The Correct Answer is 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 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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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
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.
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