The nurse observes variable decelerations on the fetal monitor tracing.

Which of the following is a correct interpretation of this finding?

Choice A rationale
Amniocentesis is a diagnostic test that involves extracting a small amount of amniotic fluid from the uterus to test for chromosomal abnormalities and genetic disorders. It is typically performed between 15 and 20 weeks of pregnancy. The fluid contains fetal cells and various chemicals produced by the baby, which can be analyzed to detect conditions such as Down syndrome, trisomy 18, and neural tube defects. This test is highly accurate and is often recommended when screening tests like the MSAFP indicate a potential issue.
Choice B rationale
A Nonstress Test (NST) is a non-invasive test that measures the fetal heart rate in response to its movements. It is used to assess fetal well-being, particularly in the third trimester, but it does not provide information about chromosomal abnormalities. The NST is typically used to monitor high-risk pregnancies and to ensure that the fetus is receiving enough oxygen.
Choice C rationale
A Biophysical Profile (BPP) combines an ultrasound with a Nonstress Test to evaluate the fetus’s health. It assesses fetal breathing movements, body movements, muscle tone, amniotic fluid volume, and heart rate reactivity. While it provides a comprehensive assessment of fetal well-being, it does not specifically diagnose chromosomal abnormalities. The BPP is often used in the third trimester to monitor high-risk pregnancies.
Choice D rationale
Chorionic Villus Sampling (CVS) is another diagnostic test that can detect chromosomal abnormalities and genetic disorders. It involves taking a small sample of placental tissue (chorionic villi) for analysis. CVS is typically performed between 10 and 13 weeks of pregnancy, earlier than amniocentesis. While it provides similar diagnostic information, it is not the test of choice following an abnormal MSAFP result, which is usually conducted later in pregnancy.

Choice A rationale
Encouraging the client to walk around for 30 minutes and then resume monitoring is not the most appropriate action in this scenario. Walking may help stimulate fetal movement, but it is not the first-line intervention when there are no accelerations or fetal movement during a nonstress test. The nurse should try other methods to stimulate fetal movement before resorting to walking.
Choice B rationale
Performing vibroacoustic stimulation is the correct action. Vibroacoustic stimulation involves using a device to produce a sound and vibration near the maternal abdomen to stimulate fetal movement and heart rate accelerations. This method is non-invasive and can help determine fetal well-being by eliciting a response from the fetus.
Choice C rationale
Immediately reporting the situation to the provider and preparing the client for induction of labor is premature. The absence of accelerations or fetal movement during a nonstress test does not immediately indicate a need for induction of labor. Other less invasive interventions, such as vibroacoustic stimulation, should be attempted first.
Choice D rationale
Repositioning the client into a supine position is not recommended. The supine position can lead to supine hypotensive syndrome, which can decrease blood flow to the fetus. The nurse should avoid placing the client in a supine position and instead try other methods to stimulate fetal movement.