Severe hypertension in pregnancy is a medical emergency, defined as systolic blood pressure (BP) ≥ 160 mm Hg and/or diastolic BP ≥ 110 mm Hg taken 15 minutes to 4 or more hours apart. Outside pregnancy, acute severe hypertension (HTN) is defined as a BP greater than 180/110 to 120 reproducible on 2 occasions. The lower threshold for severe HTN in pregnancy reflects the increased risk for adverse outcomes, particularly maternal stroke and death, and may be a source of under-recognition and treatment delay, particularly in nonobstetrical health care settings. Once a severe hypertension episode is recognized, antihypertensive therapy should be initiated as soon as feasibly possible, at least within 30 to 60 minutes. Intravenous (IV) labetalol, hydralazine, and oral immediate-release nifedipine are all recommended first-line agents and should be administered according to available institutional protocols and based on provider knowledge and familiarity.
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