The nurse is caring for a client in labor at term. The nurse reviews the external monitor tracing below. The nurse identifies that the deceleration pattern seen indicates which of the following?
Early decelerations.
Late decelerations.
Variable decelerations.
Prolonged decelerations.
The Correct Answer is B
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.
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Correct Answer is B
Explanation
Choice A rationale
Category I tracings are considered normal and are associated with a well-oxygenated, non-acidotic fetus with a normal fetal heart rate baseline, moderate variability, and no late or variable decelerations. However, a baseline heart rate of 175 bpm is considered tachycardia, which does not fit the criteria for Category I.
Choice B rationale
Category II tracings are indeterminate and include any fetal heart rate pattern that does not fit into Category I or III. A baseline heart rate of 175 bpm with moderate variability and no accelerations or decelerations fits into this category. This indicates that the fetus may be experiencing some stress but is not in immediate danger.
Choice C rationale
Category III tracings are abnormal and are associated with an increased risk of fetal acidemia. These tracings include absent baseline variability with recurrent late or variable decelerations, bradycardia, or a sinusoidal pattern. The given tracing does not meet these criteria as it shows moderate variability and no decelerations.
Choice D rationale
There is no Category IV in the classification of fetal heart rate tracings. The standard classification includes only Categories I, II, and III.
Correct Answer is B
Explanation
Choice A rationale
The presenting part being 2 cm below the ischial spines would be documented as +2 station, indicating that the fetal head is descending well into the pelvis.
Choice B rationale
The presenting part being 2 cm above the ischial spines is correctly documented as -2 station. This indicates that the fetal head is still relatively high in the pelvis and has not yet descended to the level of the ischial spines.
Choice C rationale
The presenting part being at the level of the ischial spines is documented as 0 station. This is the midpoint of the pelvis and indicates that the fetal head is engaged.
Choice D rationale
The presenting part being 2 cm below the cervix is not a standard way to describe fetal station. Station is measured relative to the ischial spines, not the cervix.