The most appropriate time for the nurse to encourage a laboring woman to push is during

The correct answer is: d. Persistent fetal bradycardia below 100 bpm.

Choice A: Maternal pulse rate of 100 bpm

A maternal pulse rate of 100 beats per minute (bpm) is slightly elevated but not uncommon during labor due to the physical exertion and stress involved. The normal range for an adult’s resting heart rate is typically between 60 and 100 bpm. While it is important to monitor the maternal pulse, it is not an immediate cause for concern unless accompanied by other symptoms such as hypotension, chest pain, or signs of distress.

Choice B: Maternal blood pressure of 120/70 mm Hg

A maternal blood pressure of 120/70 mm Hg is within the normal range. Normal blood pressure for adults is generally considered to be around 120/80 mm Hg. This reading indicates that the mother is maintaining stable blood pressure during labor, which is a positive sign. Therefore, this does not require immediate reporting to the physician.

Choice C: Decrease in intensity of uterine contractions

A decrease in the intensity of uterine contractions can be concerning as it may indicate ineffective labor, which could prolong the delivery process. However, this is typically managed by adjusting oxytocin levels or other interventions and does not require immediate reporting unless it leads to other complications such as fetal distress.

Choice D: Persistent fetal bradycardia below 100 bpm

Persistent fetal bradycardia below 100 bpm is a significant concern and should be immediately reported to the physician. Normal fetal heart rate ranges from 110 to 160 bpm. Bradycardia, defined as a heart rate below 110 bpm, can indicate fetal distress, hypoxia, or other complications that may require urgent intervention to ensure the safety of the fetus. Persistent bradycardia, especially below 100 bpm, necessitates immediate medical attention to assess and address the underlying cause.

Choice A reason:

Maternal exhaustion is a maternal indication for the use of vacuum extraction. Vacuum extraction is a technique that can assist the mother in delivering the baby when she is unable to push effectively or when pushing poses a risk to her health. Vacuum extraction can shorten the second stage of labor and reduce maternal fatigue and distress. According to the Cleveland Clinic, vacuum extraction might be indicated if "the mother can't push anymore, either due to exhaustion or a health condition.".

Choice B reason:

Failure to progress past 0 station is not a maternal indication for the use of vacuum extraction. The station refers to the position of the baby's head in relation to the mother's pelvis. 0 station means that the baby's head is at the level of the pelvic inlet, or the narrowest part of the pelvis. Vacuum extraction is usually not performed before the baby reaches +2 station, which means that the head is 2 cm below the pelvic inlet and visible at the vaginal opening. According to the American Academy of Family Physicians, vacuum extraction should not be attempted if "the fetal head is not engaged (above 0 station).".

Choice C reason:

A wide pelvic outlet is not a maternal indication for the use of vacuum extraction. The pelvic outlet is the lower part of the pelvis that forms the exit for the baby during delivery. A wide pelvic outlet means that there is more space for the baby to pass through, which can facilitate vaginal delivery and reduce the need for instrumental assistance. Vacuum extraction is more likely to be indicated when there is a narrow pelvic outlet, which can obstruct labor and cause fetal distress.

Choice D reason:

A history of rapid deliveries is not a maternal indication for the use of vacuum extraction. Rapid deliveries, also known as precipitous deliveries, are those that occur within 3 hours of the onset of labor. Rapid deliveries can pose risks to both the mother and the baby, such as excessive bleeding, umbilical cord prolapse, or birth trauma. However, vacuum extraction is not usually indicated in these cases, as it requires time and preparation to apply the device and monitor its effects. Vacuum extraction is more likely to be indicated when labor is prolonged or stalled in the second stage, and when there is a nonreassuring fetal heart rate.