Hypertensive Disorders of Pregnancy: A Can’t Miss Diagnosis

Preeclampsia is a can’t-miss cause of maternal morbidity that presents during pregnancy and up to 6 to 8 weeks postpartum. In the ED or urgent care, severe-range blood pressure alone can establish severe disease and should trigger immediate evaluation rather than waiting hours for confirmation.

Recognizing Peripartum Hypertension

• Postpartum risk window: Hypertensive disorders of pregnancy do not end at delivery; patients remain at risk for 6 to 8 weeks postpartum, so every triage screen should ask about current or recent pregnancy.
• Common and dangerous disease: Preeclampsia and related hypertensive disorders affect up to 10% of pregnancies and remain a leading cause of maternal morbidity and mortality, including after discharge.
• Spectrum of diagnoses: The framework matters: chronic hypertension begins before 20 weeks, gestational hypertension starts after 20 weeks, and preeclampsia adds proteinuria or a severe feature.
• Severe feature shorthand: It only takes one severe feature to make preeclampsia severe, and sustained severe-range blood pressure is enough on its own. That distinction is worth hearing in the chapter.

Diagnosis and Initial Evaluation

• Accurate blood pressure technique: Before labeling severe hypertension, use the correct cuff and seated or semi-reclined positioning; bad technique can misclassify risk in a time-sensitive obstetric emergency.
• Do not wait four hours: For severe-range pressures, do not wait for the classic 4-hour spacing used in milder hypertension; a 15-minute sustained recheck is the actionable bedside standard.
• Protein testing limits: Urine dipstick protein is imperfect, with roughly 60% sensitivity, so it should not be used alone to rule out preeclampsia when symptoms or pressure are concerning.
• Severe disease markers: Red flags include platelets below 100,000, creatinine above 1.1, liver enzymes more than twice normal, pulmonary edema, refractory headache, visual scotoma, and HELLP syndrome.
• Essential lab bundle: Patients with severe-range blood pressure need a focused workup with CBC, liver enzymes, creatinine, and urinalysis or a urine protein-creatinine ratio, even without other symptoms. We walk through the early ED priorities in the episode.

Emergency Recognition of Eclampsia

• Seizure equals eclampsia: New-onset generalized tonic-clonic seizure or unexplained coma in a pregnant or recently postpartum patient should be treated as eclampsia until proven otherwise.
• Superimposed preeclampsia risk: Patients with chronic hypertension can develop superimposed preeclampsia and may deteriorate quickly, making a previously familiar blood pressure history falsely reassuring.
• Symptom-based suspicion: Headache that does not respond to medication, visual symptoms, and dyspnea from pulmonary edema are major warning signs even before protein results return.
• Triage system safeguards: A visible EMR pregnancy or postpartum flag helps prevent missed diagnosis when the chief complaint looks non-obstetric, especially in recently delivered patients.

References:

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