What vital sign finding would be most concerning for a nurse monitoring a primigravida receiving magnesium sulfate?

When monitoring a primigravida receiving magnesium sulfate, a respiratory rate of 10 breaths per minute is particularly concerning due to the respiratory depressant effects of magnesium sulfate. Magnesium sulfate is commonly administered in obstetric settings, especially for conditions such as preeclampsia and to prevent seizures. One of the significant risks associated with magnesium sulfate therapy is respiratory depression, which can occur when serum magnesium levels become elevated.

A respiratory rate below 12 breaths per minute is an indicator of potential respiratory depression, which can lead to inadequate oxygenation and subsequent complications for both the mother and the fetus. Therefore, a finding of 10 breaths per minute necessitates prompt assessment and intervention, as it suggests that the patient may be in a critical state that requires immediate medical attention.

The other vital sign options do not reflect the same level of concern. A heart rate of 85 beats per minute is typically within the normal physiological range for a pregnant woman. Blood pressure of 110/70 mm Hg is also within normal limits and does not indicate any immediate danger. A temperature of 98.6°F is considered normal and poses no risk. Hence, respiratory rate is the most critical vital sign to monitor in this context, highlighting the potential for serious complications when magnesium