A nurse is using vibroacoustic stimulation (VAS) to stimulate fetal movement during a nonstress test (NST).

What action should the nurse take when applying VAS?

Place the device over the fetal back for 3 seconds

Hold the device firmly against the maternal abdomen for 10 seconds

Move the device around the maternal abdomen until fetal movement is detected

Apply the device intermittently over the fundus for 15 seconds

Answer and Explanation

The Correct Answer is A

Place the device over the fetal back for 3 seconds. This is because vibroacoustic stimulation (VAS) is the application of a vibratory sound stimulus to the abdomen of a pregnant woman to induce fetal heart rate (FHR) accelerations. The presence of FHR accelerations reliably predicts the absence of fetal metabolic acidemia. VAS is typically used during a nonstress test (NST) to assess fetal well-being. The device should be placed over the fetal back for 3 seconds, as this is the optimal duration and location to elicit a fetal response.

Choice B is wrong because holding the device firmly against the maternal abdomen for 10 seconds may be too long and too strong for the fetus, and may cause discomfort or distress.

Choice C is wrong because moving the device around the maternal abdomen until fetal movement is detected may not be effective or efficient, as the device may not reach the optimal location or duration to stimulate the fetus.

Choice D is wrong because applying the device intermittently over the fundus for 15 seconds may not target the fetal auditory system, which is located near the fetal back, and may also be too long and too strong for the fetus.

Normal ranges for FHR are between 110 and 160 beats per minute, and FHR accelerations are defined as an increase of at least 15 beats per minute above baseline for at least 15 seconds.

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Correct Answer is B

Explanation

Negative CST.A negative CST means that there are no late or significant variable decelerations of the fetal heart rate (FHR) during three uterine contractions in 10 minutes.

This indicates that the fetus is well oxygenated and can tolerate the stress of labor contractions.

Choice A is wrong because a positive CST means that there are late decelerations of the FHR with 50% or more of the contractions.

This suggests that the fetus is at risk of hypoxia and may need early delivery.

Choice C is wrong because an unsatisfactory CST means that there are fewer than three contractions in 10 minutes or the tracing is not interpretable.

This does not provide enough information to assess the fetal well-being.

Choice D is wrong because an equivocal CST means that there are either intermittent late decelerations or significant variable decelerations.

This indicates that the fetus may have some degree of compromise and may need further testing.

Normal ranges for FHR are 110 to 160 beats per minute, and for uterine contractions are 2 to 5 per 10 minutes.

A. The fetus is in a breech presentation B. The fetus has not moved for 40 minutes. C. The baseline FHR variability is minimal. D. The client has a history of stillbirth. E. The test result is nonreactive after 40 minutes.

Correct Answer is ["E"]

Explanation

The test result is nonreactive after 40 minutes.Vibroacoustic stimulation (VAS) is the application of a vibratory sound stimulus to the abdomen of a pregnant woman to induce fetal heart rate (FHR) accelerations.VAS is typically used during a nonstress test (NST) to elicit fetal movement and reactivity when the baseline FHR variability is minimal or the test result is nonreactive after 40 minutes.VAS can shorten the testing time and reduce the incidence of non-reactive cardiotocography.

Choice A is wrong because the fetus’s presentation does not affect the use of VAS.

Choice B is wrong because VAS is not indicated for a fetus that has not moved for 40 minutes, unless the NST result is also nonreactive.

Choice C is wrong because minimal baseline FHR variability is not a sufficient indication for VAS, unless the NST result is also nonreactive.

Choice D is wrong because a history of stillbirth does not affect the use of VAS.

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A nurse is using vibroacoustic stimulation (VAS) to stimulate fetal movement during a nonstress test (NST). What action should the nurse take when applying VAS?

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Naxlex Comprehensive Predictor Exams

A nurse is caring for a client who is pregnant and undergoing a contraction stress test (CST). The nurse observes three uterine contractions in 10 minutes, with no late or significant variable decelerations of the fetal heart rate (FHR). How should the nurse interpret this finding?

Correct Answer is B

Explanation

(Select all that apply) A nurse is performing a nonstress test (NST) for a client who is at 32 weeks of gestation and has gestational diabetes mellitus. The nurse uses vibroacoustic stimulation to elicit fetal movement and acceleration of FHR. What are the indications for using this method?

Correct Answer is ["E"]

Explanation

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A nurse is using vibroacoustic stimulation (VAS) to stimulate fetal movement during a nonstress test (NST).

What action should the nurse take when applying VAS?