Magnesium Sulfate Applications in Hypertensive Disorders of Pregnancy
Summary
Magnesium sulfate has been established as the mainstay for seizure prophylaxis and treatment in women with preeclampsia and eclampsia. Its anticonvulsant efficacy arises from calcium antagonism and central nervous system stabilisation, reducing neuronal excitability. Clinically, regimens typically combine an intravenous loading dose followed by a maintenance infusion, or intramuscular protocols, calibrated to achieve therapeutic serum magnesium concentrations while minimising toxicity. Use of magnesium sulfate has demonstrably lowered rates of maternal seizure and mortality, transforming management algorithms worldwide. Attention has focused on optimising dosing to balance effectiveness, side-effect profiles and resource constraints, especially in low-resource settings. Recent efforts have also examined the shortest effective duration of postpartum administration to enhance maternal mobility and infant bonding. Implementation studies highlight persistent gaps in drug availability, provider training and facility readiness, illustrating the need for integrated policy, supply-chain strengthening and capacity development to translate clinical efficacy into equitable maternal health gains globally.
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Technical terms
Preeclampsia: A hypertensive disorder of pregnancy characterised by new-onset hypertension and organ dysfunction after 20 weeks’ gestation.
Eclampsia: The occurrence of tonic–clonic seizures in a woman with preeclampsia, signifying progression to a severe neurologic complication.
Magnesium sulfate (MgSO4): A mineral salt used intravenously or intramuscularly for prophylaxis and treatment of eclamptic seizures by stabilising neuronal membranes.
Loading dose: An initial high dose administered to rapidly attain a therapeutic serum concentration.
Maintenance infusion: Continuous or intermittent dosing that sustains drug concentration within a target therapeutic window.
Pharmacokinetics: The study of drug movement through absorption, distribution, metabolism and excretion, informing dosing regimens.
References
- Clinical pharmacokinetic properties of magnesium sulphate in women with pre‐eclampsia and eclampsia. BJOG An International Journal of Obstetrics & Gynaecology (2015).
- Magnesium sulfate for 6 vs 24 hours post delivery in patients who received magnesium sulfate for less than 8 hours before birth: a randomized clinical trial. BMC Pregnancy and Childbirth (2017).
- Health facility readiness and provider knowledge as correlates of adequate diagnosis and management of pre-eclampsia in Kinshasa, Democratic Republic of Congo. BMC Health Services Research (2020).
- The Magpie Trial: a randomised trial comparing magnesium sulphate with placebo for pre‐eclampsia. Outcome for women at 2 years. BJOG An International Journal of Obstetrics & Gynaecology (2006).
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