A nurse is assisting with the care of a client who has severe preeclampsia and is receiving magnesium sulfate IV at 2 g/hr. Which of the following findings indicates that it is safe for the nurse to continue the infusion?

Choice A rationale:

Supporting the infant during birth. The priority for the nurse in this situation is to ensure the safe delivery of the baby. By supporting the infant during birth, the nurse can help ensure that the baby is delivered safely and efficiently. This involves assisting the mother in pushing and guiding the baby's head and body as it emerges from the birth canal. The nurse should also be ready to catch the baby and provide immediate care, such as drying and stimulating the baby to breathe if necessary.

Choice B rationale

Preventing the perineum from tearing. While preventing perineal tearing is important, it is not the top priority in this rapidly progressing labor scenario. The immediate concern is the safe delivery of the baby, and if perineal tearing does occur, it can be addressed after the birth.

Choice C rationale

Cutting the umbilical cord. This action is necessary but not the top priority. After the baby is delivered, the nurse should clamp and cut the umbilical cord to separate the baby from the placenta. However, this can wait until the baby is fully delivered and breathing on their own.

Choice D rationale

Promoting delivery of the placenta. Again, while delivering the placenta is important to prevent postpartum haemorrhage, it is not the priority in this scenario. The nurse's immediate focus should be on supporting the infant's delivery and ensuring the baby's well-being.

The correct answer is choice A: Respiratory rate of 16/min.

Choice A rationale:

A respiratory rate of 16/min is within the normal range for adults, which is typically between 12 to 20 breaths per minute. In the context of severe preeclampsia, maintaining a normal respiratory rate is crucial when administering magnesium sulfate IV, as one of the signs of magnesium toxicity is respiratory depression. Therefore, a respiratory rate of 16/min indicates that the client is not experiencing respiratory depression and it is safe to continue the magnesium sulfate infusion.

Choice B rationale:

A heart rate of 60/min is at the lower end of the normal range, which is 60 to 100 beats per minute for adults. However, bradycardia or a low heart rate can be a sign of magnesium sulfate toxicity, especially if accompanied by other symptoms such as hypotension or altered mental status. Without additional context, a heart rate of 60/min alone does not necessarily indicate it is unsafe to continue the infusion, but it would require further assessment.

Choice C rationale:

A urine output of 50 mL in 4 hours is significantly below the expected minimum of 30 mL/hour for adults. Adequate urine output is an important indicator of kidney function and is essential for the excretion of magnesium. In the case of magnesium sulfate infusion for severe preeclampsia, a low urine output could indicate renal insufficiency and an increased risk of magnesium toxicity. Therefore, a urine output of 50 mL in 4 hours is a contraindication for continuing the infusion without further evaluation.

Choice D rationale:

Diminished deep-tendon reflexes can be a sign of magnesium toxicity. Deep-tendon reflexes are assessed to monitor for signs of magnesium overdose during infusion, as magnesium acts as a central nervous system depressant at high levels. If deep-tendon reflexes are diminished, it may suggest that the serum magnesium levels are too high, and the infusion should be paused or discontinued to prevent further toxicity.

In summary, the only finding that clearly indicates it is safe to continue the magnesium sulfate infusion is a normal respiratory rate, as provided in choice A. The other options either require further assessment or are indicators of potential magnesium toxicity.