In a client receiving magnesium sulfate for severe preeclampsia, what would indicate potential magnesium sulfate toxicity?

In the context of a patient receiving magnesium sulfate, particularly for the management of severe preeclampsia, monitoring for signs of magnesium toxicity is crucial. The correct identification of toxicity revolves around specific clinical indicators.

Deep tendon reflexes are an important assessment parameter in this scenario. A finding of diminished or absent deep tendon reflexes (such as less than 2+) can indicate magnesium toxicity. Magnesium sulfate acts as a central nervous system depressant and can impair reflexes as serum magnesium levels rise excessively. Therefore, a deep tendon reflex rating of 2+ suggests normal reflex activity, while a lower rating could indicate that magnesium levels are approaching a toxic threshold.

The other indicators mentioned do not directly signify magnesium toxicity. For example, a blood pressure of 140/90 might still reflect the effects of severe preeclampsia rather than magnesium toxicity. Similarly, a respiratory rate of 18/min is considered within normal limits and does not reflect respiratory depression, which can occur with severe magnesium toxicity. Urine output is a valuable parameter to monitor renal function and hydration status but does not specifically indicate toxicity related to magnesium sulfate. Collectively, these considerations emphasize the significance of deep tendon reflex assessments in monitoring magnesium levels and potential toxicity effectively.