When interpreting a fetal monitoring tracing, which of the following findings would require the nurse to intervene?
Presence of late decelerations.
Variability in fetal heart rate of 12 bpm.
Accelerations in fetal heart rate.
Baseline fetal heart rate of 140 bpm.
The Correct Answer is A
Choice A rationale
Late decelerations are a sign of uteroplacental insufficiency and fetal hypoxia. They occur after the peak of a contraction and indicate that the fetus is not receiving enough oxygen. This requires immediate intervention to improve fetal oxygenation and prevent fetal distress.
Choice B rationale
Variability in fetal heart rate of 12 bpm is considered moderate variability, which is a reassuring sign of fetal well-being. It indicates that the fetus has a healthy autonomic nervous system and is not in distress.
Choice C rationale
Accelerations in fetal heart rate are also a reassuring sign. They indicate that the fetus is well-oxygenated and responding appropriately to stimuli. No intervention is needed for accelerations.
Choice D rationale
A baseline fetal heart rate of 140 bpm is within the normal range (110-160 bpm) and does not indicate any immediate concern. It is a sign of a healthy, well-oxygenated fetus.
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View Related questions
Correct Answer is A
Explanation
Choice A rationale
Terbutaline is a beta-adrenergic agonist that works by relaxing the smooth muscles of the uterus, thereby reducing uterine contractions. It is commonly used in cases of tachysystole and recurrent late decelerations to decrease uterine activity and improve fetal oxygenation. Terbutaline’s mechanism of action involves stimulating beta-2 adrenergic receptors, which leads to an increase in cyclic AMP and subsequent relaxation of uterine smooth muscle.
Choice B rationale
Oxytocin is a hormone that stimulates uterine contractions and is typically used to induce or augment labor. Administering oxytocin in a situation where there is already tachysystole and recurrent late decelerations would exacerbate the problem by increasing uterine contractions, potentially leading to further fetal distress.
Choice C rationale
Misoprostol is a prostaglandin analog used to ripen the cervix and induce labor. Similar to oxytocin, it would not be appropriate in this scenario as it would increase uterine contractions, worsening the tachysystole and late decelerations.
Choice D rationale
Magnesium sulfate is primarily used as a tocolytic to prevent preterm labor and as a neuroprotective agent for the fetus in cases of preeclampsia. While it has some uterine relaxation properties, it is not the first-line treatment for reducing uterine activity in the context of tachysystole and late decelerations.
Correct Answer is B
Explanation
Choice A rationale
Monitoring the patient’s vocalizations and facial expressions can provide some information about the intensity of contractions, but it is subjective and not a reliable method for accurately assessing contraction intensity.
Choice B rationale
Palpating the maternal abdomen during a contraction is the best method for determining the intensity of contractions. By feeling the firmness of the uterus, the nurse can assess whether the contractions are mild, moderate, or strong. This method provides a more objective measure of contraction intensity compared to other methods.
Choice C rationale
Timing the amount of time between the ending of one contraction and the beginning of the next provides information about the frequency of contractions, not their intensity. This choice does not address the question of how to determine contraction intensity.
Choice D rationale
Palpating the maternal abdomen right after a contraction does not provide information about the intensity of the contraction that just occurred. The uterus will be relaxed after the contraction, making it difficult to assess the strength of the previous contraction.