Preeclampsia and Eclampsia — ED Stabilization

Key Points

• Severe-range blood pressure in pregnancy or postpartum is a time-sensitive maternal stroke risk and should be treated promptly.
• Preeclampsia can be diagnosed without proteinuria when hypertension is accompanied by qualifying end-organ dysfunction.
• Eclampsia is treated first-line with magnesium sulfate, not with phenytoin as routine initial therapy.
• Magnesium dosing requires close monitoring when renal function is impaired because toxicity risk increases.
• HELLP syndrome may present with epigastric or right upper quadrant pain and can occur even when blood pressure abnormalities are not dramatic.
• Fluid administration should be conservative and guided by clinical need because pulmonary edema is a recognized complication.
• Preeclampsia and eclampsia can first present postpartum, including after discharge from the delivery hospitalization.
• Delivery is definitive therapy but follows maternal stabilization and multidisciplinary obstetric planning.

Algorithm

1. Confirm severe blood pressure promptly and assess airway, breathing, circulation, mental status, symptoms, gestational age, and postpartum status.
2. Place IV access, obtain CBC, platelets, creatinine, liver tests, urine protein assessment, and additional studies based on presentation.
3. Activate obstetrics and maternal-fetal medicine pathways and begin fetal assessment when appropriate.
4. Treat persistent severe hypertension with IV labetalol, IV hydralazine, or immediate-release oral nifedipine according to protocol.
5. Give magnesium sulfate for eclampsia and for seizure prophylaxis when severe features indicate it.
6. Reassess blood pressure, neurologic status, respiratory status, urine output, reflexes, and fetal condition frequently.
7. Treat pulmonary edema, hemorrhage, renal injury, HELLP syndrome, or other complications and obtain critical care support when needed.
8. Proceed to delivery planning once maternal stabilization is underway; admit patients with severe features or eclampsia.

Clinical Synopsis & Reasoning

Preeclampsia is a pregnancy-specific hypertensive disorder that usually develops after 20 weeks of gestation and can also present postpartum. Hypertension with proteinuria is classic, but severe disease may be diagnosed with hypertension plus end-organ findings even without proteinuria. Severe features include persistent severe-range blood pressure, thrombocytopenia, renal insufficiency, impaired liver function with severe right upper quadrant or epigastric pain, pulmonary edema, or new neurologic or visual symptoms. Eclampsia is a new generalized seizure in a patient with preeclampsia when another cause is not more likely.

Emergency assessment should confirm blood pressure with correct cuff size and repeated measurements while simultaneously evaluating symptoms, gestational age, fetal status, and complications. Severe persistent hypertension, conventionally systolic 160 mm Hg or higher or diastolic 110 mm Hg or higher, requires urgent treatment because maternal stroke risk rises with sustained severe pressure. Headache, visual disturbance, dyspnea, chest pain, altered mental status, abdominal pain, vaginal bleeding, or decreased fetal movement require rapid escalation. Postpartum patients remain at risk and may present after hospital discharge.

Laboratory evaluation commonly includes CBC with platelets, creatinine, AST and ALT, bilirubin and LDH when hemolysis is suspected, urinalysis or urine protein assessment, and additional studies guided by the differential. HELLP syndrome involves hemolysis, elevated liver enzymes, and low platelets and may occur with or without dramatic hypertension. Consider intracranial hemorrhage, cerebral venous thrombosis, epilepsy, metabolic disease, toxic exposure, or posterior reversible encephalopathy when neurologic findings are atypical or persistent.

Treatment Strategy & Disposition

Treat ongoing severe hypertension promptly with an accepted first-line agent such as IV labetalol, IV hydralazine, or immediate-release oral nifedipine. Choice depends on access, contraindications, heart rate, asthma, and local obstetric protocols. The goal is to reduce the immediate risk of maternal cerebral and cardiovascular injury while avoiding abrupt hypotension that may impair uteroplacental perfusion. Continuous maternal reassessment and fetal monitoring should accompany treatment when gestational age and circumstances permit.

Magnesium sulfate is first-line therapy for treatment of eclamptic seizures and is used for seizure prophylaxis in preeclampsia with severe features according to obstetric guidance. A common regimen is a 4 to 6 g IV loading dose followed by 1 to 2 g/hour infusion. Monitor respiratory rate, reflexes, mental status, and urine output because magnesium is renally cleared. Calcium gluconate should be immediately available for clinically significant magnesium toxicity. Recurrent seizure despite magnesium requires obstetric, anesthesia, and critical care support and evaluation for an alternate or additional neurologic cause.

Definitive management is delivery, but timing depends on maternal stability, gestational age, fetal status, and obstetric assessment. The emergency clinician should not independently delay stabilization while awaiting a delivery plan. Admit all patients with eclampsia or severe features, and involve obstetrics immediately. Pulmonary edema requires oxygenation and ventilatory support with careful fluid management. Avoid routine aggressive crystalloid loading because endothelial dysfunction and capillary leak increase pulmonary edema risk.

Epidemiology / Risk Factors

• Hypertensive disorders of pregnancy are major contributors to maternal morbidity and mortality worldwide.
• Risk factors include prior preeclampsia, multifetal gestation, chronic hypertension, kidney disease, diabetes, autoimmune disease, and certain first-pregnancy or demographic factors.
• Disease can arise antepartum, intrapartum, or postpartum, so recent delivery does not remove the diagnosis from consideration.
• Severe maternal complications include stroke, pulmonary edema, acute kidney injury, hepatic injury or rupture, DIC, placental abruption, and eclampsia.
• Fetal consequences are related to placental dysfunction, growth restriction, preterm delivery, and abruption.

Investigations

Antihypertensive Options (ED)

Pharmacology

Prognosis / Complications

• Outcome is generally favorable when severe hypertension and seizures are treated promptly and definitive obstetric care is available.
• Stroke, pulmonary edema, HELLP syndrome, liver rupture, renal failure, and DIC markedly increase maternal risk.
• Patients with a history of preeclampsia have increased long-term cardiovascular risk and need primary care follow-up after pregnancy.
• Recurrence risk in a future pregnancy depends on gestational age and severity of prior disease and underlying maternal conditions.
• Fetal prognosis is strongly influenced by gestational age, placental function, and whether urgent delivery is required.

Patient Education / Counseling

• Explain that severe headache, visual changes, shortness of breath, chest pain, severe abdominal pain, seizure, or very high blood pressure after delivery require immediate evaluation.
• Patients prescribed home blood pressure monitoring should receive clear thresholds and a specific plan for whom to contact.
• Discuss medication adherence after discharge because antihypertensive therapy may be needed temporarily postpartum.
• After recovery, patients should be informed that preeclampsia is associated with higher future cardiovascular risk and should be incorporated into long-term preventive care.
• Future pregnancy planning should include early prenatal care and review of whether low-dose aspirin prevention is indicated.
• Counsel that symptoms can recur or worsen after delivery and that delivery does not produce instantaneous resolution of maternal risk.

Notes

Persistent severe hypertension in pregnancy and postpartum should be treated as an emergency rather than a routine outpatient blood pressure problem. Therapy is directed at preventing maternal cerebrovascular and cardiopulmonary complications while obstetric specialists determine timing of delivery and ongoing monitoring.

A seizure in late pregnancy or the postpartum period should be presumed eclamptic when the clinical setting fits, while simultaneously considering alternative neurologic causes if the presentation is atypical.

References

1. ACOG Gestational Hypertension and Preeclampsia — Link
2. ACOG Severe Hypertension Resources — Link