The nurse is reading the results of non-stress test (NST) strips completed that day. Which of the following strips meets the criteria for a reactive NST? Select one:
A fetal heart rate baseline of 140 with one acceleration to 155 for 15 seconds within 30 minutes.
A fetal heart rate baseline of 140 with two accelerations to 160 for 15 seconds within 20 minutes.
A fetal heart rate baseline of 130 with two accelerations to 135 for 15 seconds within 20 minutes.
A fetal heart rate baseline of 150 with two accelerations to 160 for 10 seconds within 20 minutes.
The Correct Answer is B
Choice A Reason: A fetal heart rate baseline of 140 with one acceleration to 155 for 15 seconds within 30 minutes. This is an incorrect answer that indicates a non-reactive NST, which is a test that does not meet the criteria for a reactive NST. A non-reactive NST may suggest fetal hypoxia, distress, or sleep, but it does not necessarily indicate a problem. A non-reactive NST may require further testing or stimulation to elicit a reactive result.
Choice B Reason A fetal heart rate baseline of 140 with two accelerations to 160 for 15 seconds within 20 minutes. This is because this strip meets the criteria for a reactive NST, which is a non-invasive test that evaluates fetal well- being and oxygenation by measuring the fetal heart rate response to fetal movements. A reactive NST is defined as having at least two accelerations of the fetal heart rate that are at least 15 beats per minute above the baseline and last for at least 15 seconds within a 20-minute period.
Choice C Reason: A fetal heart rate baseline of 130 with two accelerations to 135 for 15 seconds within 20 minutes. This is an incorrect answer that indicates a non-reactive NST, which is a test that does not meet the criteria for a reactive NST. The accelerations in this strip are not sufficient in amplitude, as they are only 5 beats per minute above the baseline, instead of at least 15 beats per minute.
Choice D Reason: A fetal heart rate baseline of 150 with two accelerations to 160 for 10 seconds within 20 minutes. This is an incorrect answer that indicates a non-reactive NST, which is a test that does not meet the criteria for a reactive NST. The accelerations in this strip are not sufficient in duration, as they last only for 10 seconds, instead of at least 15 seconds.

Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A Reason: Possible Meconium Aspiration Syndrome (MAS). This is an unlikely condition for this newborn, as MAS occurs when fetal stool (meconium) enters into the lungs before or during birth, causing airway obstruction, inflammation, and infection. MAS usually affects term or post-term infants who experience fetal distress or hypoxia in utero.
Choice B Reason: Possible polycythemia. This is an unrelated condition for this newborn, as polycythemia refers to an abnormally high number of red blood cells in the blood, which can increase blood viscosity and impair circulation.
Polycythemia may occur in infants who have delayed cord clamping, intrauterine growth restriction, maternal diabetes, or high altitude exposure.
Choice C Reason: Possible Transient Tachypnea of the Newborn (TTN). This is a less serious condition than RDS, as TTN is a mild respiratory problem that results from delayed clearance of fetal lung fluid after birth. TTN causes rapid breathing, nasal flaring, grunting, and mild cyanosis. It usually resolves within 24 to 48 hours after birth.
Choice D Reason: Possible Respiratory Distress Syndrome (RDS). This is a serious condition that requires immediate intervention and treatment, as RDS can lead to life-threatening complications such as pulmonary hemorrhage, pneumothorax, or bronchopulmonary dysplasia. RDS causes respiratory distress, nasal flaring, retractions, grunting, and central cyanosis. It usually occurs within minutes to hours after birth.
Correct Answer is D
Explanation
Choice A Reason: Respiratory rate of 16. This is an incorrect answer that indicates a normal finding that does not suggest magnesium sulfate toxicity. Respiratory rate is a measure of the number of breaths per minute, which reflects the respiratory function and oxygenation status. Respiratory rate of 16 is within the normal range for adults, which is 12 to 20 breaths per minute. Respiratory rate of 16 does not indicate magnesium sulfate toxicity, which can cause respiratory rate below 12 breaths per minute.
Choice B Reason: Complaints by the client of feeling flushed and warm. This is an incorrect answer that indicates a common side effect that does not indicate magnesium sulfate toxicity. Feeling flushed and warm are sensations that are caused by vasodilation (widening of blood vessels), which can occur as a result of magnesium sulfate administration. Feeling flushed and warm are not signs of magnesium sulfate toxicity, but rather expected and mild reactions that usually subside within a few hours.
Choice C Reason: Fetal heart rate of 120. This is an incorrect answer that indicates a normal finding that does not suggest magnesium sulfate toxicity. Fetal heart rate is a measure of the number of beats per minute of the fetal heart, which reflects the fetal well-being and oxygenation status. Fetal heart rate of 120 is within the normal range for fetuses, which is 110 to 160 beats per minute. Fetal heart rate of 120 does not indicate magnesium sulfate toxicity, which can cause fetal heart rate below 110 beats per minute or above 160 beats per minute.
Choice D Reason: Patellar reflexes are absent. This is because absent patellar reflexes are a sign of magnesium sulfate toxicity, which is a condition where the level of magnesium in the blood is too high, which can cause adverse effects on the neuromuscular and cardiovascular systems. Magnesium sulfate is a medication that is used to prevent or treat preterm labor, which is labor that occurs before 37 weeks of gestation. Magnesium sulfate works by relaxing the uterine muscles and inhibiting uterine contractions. However, magnesium sulfate can also affect other muscles and nerves in the body, and cause symptoms such as muscle weakness, respiratory depression, hypotension, or cardiac arrest.

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