Which adverse effects should a nurse monitor for in a client receiving magnesium sulfate for preterm labor?

When a client is receiving magnesium sulfate for preterm labor, monitoring for depressed respirations and extreme muscle weakness is crucial due to the pharmacological effects of magnesium on the central nervous system and muscular system. Magnesium sulfate acts as a central nervous system depressant, which can lead to respiratory depression, especially when given in higher doses or when renal function is impaired.

Depressed respiratory function can manifest as a decrease in the respiratory rate, suggesting that the patient may not be able to adequately ventilate their lungs. Likewise, extreme muscle weakness may occur due to the neuromuscular blocking effects of magnesium, impacting muscle control and strength. This can lead to complications, making it vital for the nurse to continually assess these parameters to ensure patient safety and timely intervention if adverse effects arise.

In contrast, other symptoms such as flushing and increased heart rate, hyperactivity and increased urine output, and headache and dizziness do not directly relate to the key concerns associated with magnesium sulfate therapy. While some of these symptoms may occur due to other factors or reactions, they are not the primary adverse effects requiring vigilant monitoring in the context of magnesium sulfate administration.