A client who received intravenous magnesium sulfate for preeclampsia gives birth. What clinical finding in the newborn indicates to the nurse that magnesium sulfate toxicity may have occurred?
1. Pallor
2. Tremor
3. Hypotonia
4. Tachycardia

Option 3 => Hypotonia.

Explanation:

Magnesium sulfate are used for the treatment of women that develop Preeclampsia during pregnancy period. The cause of Preeclampsia might be because of something related to genetics or when the blood flow to the uterus is low. Preeclampsia might also occur because the woman's immune system is low.

The main symptom of Preeclampsia is high blood pressure. Other symptoms are vomiting, blurry vision, headaches, swelling and many more.

The use of magnesium sulfate for preeclampsia can be toxic for newborn and cause babies to have low muscle tone known as hypotonia.

When the nurse discover that the newborn has Hypotonia it means that the baby is suffering from toxicity of magnesium sulfate.