Which is the drug of choice in the management of eclampsia?

UPPSC-2021

Obstetrics & Gynaecology

Easy

Appeared in: UPPSC-2021

Explanation

Magnesium sulfate is the established first-line anticonvulsant agent for both the treatment of active eclamptic seizures and prophylaxis in patients with severe preeclampsia.
Its superiority is supported by extensive evidence from large-scale randomized controlled trials, such as the Magpie Trial, which showed it significantly reduces the risk of eclampsia by over 50% compared to placebo.
Compared to other anticonvulsants like diazepam and phenytoin, magnesium sulfate is more effective at preventing recurrent seizures and is associated with a lower risk of maternal mortality.
It acts as a CNS depressant, raising the seizure threshold, and also has a mild vasodilatory effect that can help reduce blood pressure.

Option A: Diazepam is a second-line agent for eclampsia, used only when magnesium sulfate is contraindicated or unavailable. It carries a significantly higher risk of maternal and neonatal respiratory depression.
Option B: Epsolin (Phenytoin) has been shown in clinical trials to be less effective than magnesium sulfate for the prevention of recurrent eclamptic seizures. It also has a slower onset of action.
Option D: Labetalol is an antihypertensive medication, not an anticonvulsant. Its role in eclampsia is to control severe hypertension (e.g., BP greater than 160/110 mmHg) to prevent cerebrovascular accidents (stroke), not to manage seizures.

Clinical Relevance

Nursing practice connection: Knowing Pharmacological management of eclampsia helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
The nurse's role in managing a patient with eclampsia is critical. This includes ensuring rapid IV access, administering magnesium sulfate correctly, and performing vigilant hourly monitoring for signs of toxicity.
Recognizing the early signs of magnesium toxicity (loss of deep tendon reflexes, respiratory depression) and acting quickly by stopping the infusion and notifying the provider can prevent respiratory or cardiac arrest.
The antidote, calcium gluconate, must be immediately accessible at the patient's bedside whenever magnesium sulfate is being administered.

How to Approach the Question

First, identify the key clinical condition in the question stem, which is 'eclampsia'.
Recall that eclampsia is a severe complication of pregnancy defined by new-onset tonic-clonic seizures in a woman with preeclampsia.
The question asks for the 'drug of choice,' which implies the standard, first-line treatment.
Evaluate the options based on their primary pharmacological action in the context of eclampsia.
Magnesium sulfate is the specific, evidence-based anticonvulsant for eclampsia.
Differentiate the other options: Labetalol is an antihypertensive, while Diazepam and Epsolin (phenytoin) are second-line or less effective anticonvulsants for this specific condition.

Concept Tested & Keywords

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E6 Obstetrics Williams p. 33-54