In a severe pre-eclamptic patient, recommended dose of MgSO4 by ZUSPAN method is?

NORCET-7 Mains-2024

Obstetrics & Gynaecology

Easy

Appeared in: NORCET-7 Mains-2024

Explanation

The Zuspan regimen is a widely used protocol for administering magnesium sulfate (MgSO₄) to prevent seizures in patients with severe pre-eclampsia and eclampsia.
This regimen is administered exclusively via the intravenous (IV) route.
It consists of a loading dose of 4 grams of MgSO₄, typically diluted in 100 mL of fluid and infused over 15-20 minutes.
This is followed by a continuous maintenance infusion at a rate of 1 gram per hour.
The goal is to achieve and maintain a therapeutic serum magnesium level of 4 to 7 mEq/L to provide anticonvulsant effects.

Option B: This option incorrectly combines an IV loading dose with an intramuscular (IM) maintenance dose. The Zuspan regimen is IV-only. An IM component is characteristic of the Pritchard regimen.
Option C: A maintenance dose of 20 g IM is dangerously high and would almost certainly lead to severe magnesium toxicity, including respiratory arrest and cardiac arrest. This dosage is never used.
Option D: While some modified protocols or the Sibai regimen use a 2 g/hour maintenance infusion, the classic Zuspan regimen specifies a rate of 1 g/hour.

Visual 1: Table - A comparative table of the Zuspan, Pritchard, and Sibai regimens, showing the route, loading dose, and maintenance dose for each. This helps learners differentiate the three main protocols.
Visual 2: Flowchart - A flowchart illustrating the nursing assessment and management of magnesium sulfate toxicity. It should start with routine checks (reflexes, RR, urine output) and branch to actions if signs of toxicity are present (stop infusion, administer calcium gluconate).
Visual 3: Infographic - An infographic showing the signs of magnesium toxicity corresponding to increasing serum levels (e.g., loss of DTRs at 10 mEq/L, respiratory depression at 12 mEq/L).

Clinical Relevance

Nursing practice connection: Use the key finding related to The concept tested is the knowledge of the specific dosage and administration route for the Zuspan regimen of magnesium sulfate (MgSO₄) in the management of severe pre-eclampsia to guide bedside assessment, documentation, and the next nursing action.
Knowing the correct MgSO₄ regimen is critical for patient safety. Dosing errors can lead to either sub-therapeutic levels (risking seizures) or toxicity (risking respiratory/cardiac arrest).
Nurses play a vital role in monitoring for signs of magnesium toxicity. The absence of the patellar reflex is the earliest sign, and its assessment is a key nursing responsibility before administering further doses or continuing the infusion.
The antidote for magnesium toxicity, calcium gluconate, must be immediately accessible at the bedside whenever a patient is receiving MgSO₄.

How to Approach the Question

First, identify the key terms in the question: 'severe pre-eclamptic patient', 'MgSO4', and 'ZUSPAN method'. The question is asking for a specific drug regimen.
This is a factual recall question. You need to access your knowledge about the different magnesium sulfate protocols used in obstetrics.
Recall the specifics of the Zuspan regimen. Key features are that it is an IV-only method.
Systematically evaluate each option against the known parameters of the Zuspan regimen.
Option A: 4g IV loading dose, 1g/hr IV maintenance. This matches the classic Zuspan protocol.
Option B & C: These mention an IM maintenance dose. This immediately disqualifies them as the Zuspan regimen is IV-only. These doses are also incorrect for other regimens.

Concept Tested & Keywords

Concept Tested: The concept tested is the knowledge of the specific dosage and administration route for the Zuspan regimen of magnesium sulfate (MgSO₄) in the management of severe pre-eclampsia.
Stem keywords: severe pre-eclamptic, MgSO4, ZUSPAN method, dose
Lead-in keywords: recommended dose
Negative lead-in flag: false

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