A pregnant lady 38 weeks of gestation diagnosed for preeclampsia is receiving magnesium therapy. Which of the following parameter should assess on priority basis?

1. A

   Respiratory depression

2. B

   Urine output

3. C

   Airway clearance

4. D

   Knee jerk reflex

Appeared in: NORCET 5 mains

Explanation

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• The absence of the knee jerk reflex (a deep tendon reflex) is the earliest and most common initial sign of magnesium sulfate toxicity.
• This sign appears at serum magnesium levels of approximately 7-10 mEq/L, which is just above the therapeutic range.
• Assessing for the loss of this reflex is a priority because it serves as a critical warning sign of impending, more severe toxicity, such as respiratory depression.
• Early detection allows the nurse to stop the infusion and notify the provider, preventing progression to life-threatening complications.

Why Other Options Were Wrong

• Option A: This is a late and severe sign of magnesium toxicity, occurring after the loss of deep tendon reflexes. The priority is to assess for the earliest sign to prevent this life-threatening complication.
• Option B: While monitoring urine output is crucial because magnesium is cleared renally, it is an indirect measure of the risk of toxicity. The knee jerk reflex is a direct measure of current neuromuscular toxicity.
• Option C: Airway clearance is not a primary sign of magnesium toxicity. It is a secondary concern that would need to be addressed if the patient's level of consciousness or respiratory effort becomes severely compromised due to high magnesium levels.

Related Visual

• Visual 1: Table - A chart illustrating the signs of magnesium toxicity correlated with serum magnesium levels (mEq/L), showing the progression from loss of reflexes (7-10 mEq/L) to respiratory depression (10-12 mEq/L) and cardiac arrest (greater than 12 mEq/L).
• Visual 2: Illustration - A simple diagram showing a nurse using a reflex hammer to test the patellar (knee-jerk) reflex on a pregnant patient lying in bed.

Clinical Relevance

• Nursing practice connection: Knowing Monitoring for Magnesium Sulfate Toxicity in Preeclampsia helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
• Nurses caring for patients on magnesium sulfate must conduct frequent assessments, typically every 1-2 hours, including checking deep tendon reflexes, respiratory rate, oxygen saturation, urine output, and level of consciousness.
• The antidote for magnesium sulfate toxicity, calcium gluconate (1g IV over 3 minutes), must be immediately available at the patient's bedside.
• Patient safety depends on the nurse's ability to recognize the earliest signs of toxicity and intervene promptly by stopping the infusion and alerting the healthcare provider.

How to Approach the Question

• First, identify the question type as a clinical scenario requiring prioritization of nursing assessments.
• Next, identify the key clinical concept: the administration of magnesium sulfate and its potential for toxicity.
• Recall the signs and symptoms of magnesium toxicity and, crucially, the order in which they typically appear.
• Understand that a 'priority' assessment in this context means identifying the earliest warning sign to prevent a more severe outcome.
• Evaluate the options based on the progression of toxicity: Loss of deep tendon reflexes (knee jerk) precedes respiratory depression.
• Conclude that assessing the knee jerk reflex is the highest priority because it allows for the earliest possible intervention.

Concept Tested & Keywords

• Concept Tested: Monitoring for Magnesium Sulfate Toxicity in Preeclampsia
• Stem keywords: pregnant, preeclampsia, magnesium therapy, assess
• Lead-in keywords: priority basis
• Clinical cues: Patient receiving magnesium therapy, which has a narrow therapeutic index and significant potential for toxicity.

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