What is the D.O.C (Drug of Choice) for Eclampsia?

Bihar CHO - 2021

Obstetrics & Gynaecology

Easy

Appeared in: Bihar CHO - 2021

Explanation

Magnesium Sulfate (MgSO₄) is the first-line drug for treating and preventing seizures in eclampsia.
It acts as a central nervous system depressant, cerebral vasodilator, and membrane stabilizer.
Large-scale clinical trials, such as the Magpie Trial, have confirmed its superiority over placebo and other anticonvulsants like phenytoin and diazepam in reducing the risk of eclampsia and maternal mortality.
Its primary role is seizure control, which is the most immediate life-threatening aspect of eclampsia for both mother and fetus.

Option B: Phenytoin is an anticonvulsant, but it is significantly less effective than MgSO₄ for managing eclamptic seizures and is considered a second-line therapy.
Option C: Labetalol is an antihypertensive agent (a beta-blocker) used to control severe high blood pressure in eclampsia, not to treat or prevent seizures.
Option D: Hydralazine is an antihypertensive agent (a direct vasodilator) used to control severe high blood pressure. It does not have anticonvulsant properties.

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 administering MgSO₄ is critical and includes vigilant monitoring for signs of toxicity, which can be life-threatening. Key assessments include respiratory rate, deep tendon reflexes, and urine output.
Having the antidote, calcium gluconate, immediately available at the bedside is a crucial patient safety measure during MgSO₄ infusion.
Nurses must be able to differentiate between the management of seizures (with MgSO₄) and the management of hypertension (with labetalol/hydralazine), as both are critical components of eclampsia care.

How to Approach the Question

First, identify the core clinical problem in the question: 'Eclampsia'. This is an obstetric emergency defined by the onset of seizures in a woman with preeclampsia.
Next, determine the primary, life-threatening component of eclampsia that requires immediate treatment. This is the seizure activity.
Analyze the options provided and classify each drug by its primary function. MgSO₄ and Phenytoin are anticonvulsants. Labetalol and Hydralazine are antihypertensives.
Since the question asks for the drug of choice for eclampsia (seizures), eliminate the antihypertensives (Labetalol, Hydralazine) as they treat blood pressure, not the seizures themselves.
Between the two anticonvulsants, recall or deduce the first-line, most effective agent. Clinical guidelines and evidence overwhelmingly support Magnesium Sulfate as superior to Phenytoin for this specific indication.
Select MgSO₄ as the correct answer based on its established efficacy and role as the standard of care.

Concept Tested & Keywords

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E6 Obstetrics Williams p. 33-53