Which of the following noted on the assessment of a pregnant mother receiving magnesium sulfate for the management of preeclampsia determines that the client is experiencing toxicity?

Correct option is B

Ans. (b) Respirations of 10 breaths/min
Sol. Magnesium sulfate toxicity can lead to respiratory depression, with a respiratory rate below 12 breaths per minute being a critical warning sign. Severe toxicity can also cause hypotension, loss of deep tendon reflexes, and cardiac arrest.
Explanation of each option:
· (a) Proteinuria of 3+ – Incorrect. Proteinuria is a sign of preeclampsia, not magnesium toxicity.
· (b) Respirations of 10 breaths/min – Correct answer. Respiratory depression is a key indicator of magnesium sulfate toxicity.
· (c) Serum magnesium level of 6 mEq/L – Incorrect. Magnesium levels above 8-10 mEq/L are typically associated with toxicity.
· (d) Presence of deep tendon reflexes – Incorrect. Loss of deep tendon reflexes (not presence) is an early sign of magnesium toxicity.