Episode Details

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Hypertensive disorders of pregnancy (HDP) complicate up to 16% of pregnancies and are a leading cause of maternal mortality in the United States. Understanding HDP requires focusing on four main classifications, the underlying placental pathology, and the critical medical interventions used to prevent fatal outcomes.

1. Core Classifications

• Chronic Hypertension: Blood pressure exceeding 140/90 mm Hg existing before pregnancy or diagnosed before 20 weeks of gestation. Up to 25% of these patients develop superimposed preeclampsia.
• Gestational Hypertension: New onset of blood pressure over 140/90 mm Hg after 20 weeks of gestation, without proteinuria or organ dysfunction. It is a temporary diagnosis that typically disappears within 12 weeks postpartum.
• Preeclampsia and Eclampsia: Preeclampsia is new-onset hypertension after 20 weeks accompanied by proteinuria or maternal organ dysfunction affecting the cardiovascular, hepatic, renal, or central nervous systems. "Severe features" include blood pressure over 160/110 mm Hg, severe headaches, visual disturbances, and right upper quadrant pain. If preeclampsia progresses to generalized tonic-clonic seizures, it is classified as Eclampsia, a severe medical emergency.
• HELLP Syndrome: A life-threatening variant of severe preeclampsia characterized by Hemolysis, Elevated Liver enzymes, and Low Platelet count. It involves microangiopathic hemolytic anemia and severe liver impairment, requiring aggressive treatment and prompt delivery.

2. The Underlying Pathophysiology The central driver of preeclampsia and its severe variants is abnormal placental development. In a healthy pregnancy, spiral arteries in the placenta widen to handle the body's increased blood volume. In preeclampsia, this vital remodeling fails, leaving the vessels narrow and causing reduced placental perfusion and fetal hypoxia. The stressed placenta releases cytotoxic substances into the maternal bloodstream, triggering widespread systemic inflammation, endothelial cell dysfunction, and generalized vasospasm. This systemic vasospasm is what directly causes hypertension and poor organ perfusion across the maternal body.

3. Critical Management and Interventions

• Prevention: For individuals at high risk of developing preeclampsia, daily low-dose aspirin (81 mg) starting between 12 and 16 weeks of gestation is recommended to improve placental circulation.
• Monitoring: Health care providers must strictly monitor blood pressure, weight gain, proteinuria, deep tendon reflexes (DTRs), and ankle clonus, which is a major sign of central nervous system irritability. Fetal surveillance via continuous electronic monitoring and ultrasounds is essential to assess ongoing fetal well-being and growth restrictions.
• Pharmacology: Antihypertensives such as labetalol, nifedipine, methyldopa, and hydralazine are utilized to manage severe blood pressure elevations. Magnesium sulfate is the essential intravenous medication used to prevent and treat eclamptic seizures. Nurses must closely monitor patients for magnesium toxicity—indicated by absent DTRs, respiratory depression, and decreased urine output—using calcium gluconate as an immediate antidote.
• Delivery: While expectant management is used for cases without severe features, the ultimate, definitive treatment for severe preeclampsia, eclampsia, and HELLP syndrome is the prompt delivery of the fetus and placen