A nurse is caring for a client at 38 weeks gestation who arrived to the triage with complaints of decreased fetal movement. The nurse contacts the provider and reports the findings. The nurse anticipates an order for which of the following?
Non-stress test.
Biophysical profile.
Ultrasound.
Amniocentesis.
The Correct Answer is A
Choice A rationale
A non-stress test (NST) is a common initial assessment for decreased fetal movement. It evaluates fetal heart rate patterns in response to fetal movements, providing information about fetal well-being and oxygenation.
Choice B rationale
A biophysical profile (BPP) is a more comprehensive assessment that includes an NST and ultrasound evaluation of fetal movements, tone, breathing, and amniotic fluid volume. It may be ordered if the NST results are non-reassuring or if there are other concerns.
Choice C rationale
An ultrasound can provide valuable information about fetal growth, amniotic fluid volume, and placental function. It may be used in conjunction with other tests but is not the first-line assessment for decreased fetal movement.
Choice D rationale
Amniocentesis is an invasive procedure used for specific indications, such as genetic testing or assessing fetal lung maturity. It is not typically used for initial assessment of decreased fetal movement.
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Correct Answer is A
Explanation
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.
Correct Answer is B
Explanation
Choice A rationale
Early decelerations are characterized by a gradual decrease and return to baseline of the fetal heart rate that coincides with the peak of a contraction. They are typically benign and related to fetal head compression.
Choice B rationale
Late decelerations are characterized by a gradual decrease and return to baseline of the fetal heart rate that occurs after the peak of a contraction. They are associated with uteroplacental insufficiency and require prompt intervention to improve fetal oxygenation.
Choice C rationale
Variable decelerations are characterized by an abrupt decrease in fetal heart rate that varies in duration, intensity, and timing relative to contractions. They are often caused by umbilical cord compression and may require interventions to relieve the compression.
Choice D rationale
Prolonged decelerations are characterized by a decrease in fetal heart rate that lasts longer than 2 minutes but less than 10 minutes. They indicate a more severe and sustained disruption in fetal oxygenation and require immediate intervention.