Incidence and Risk Factors for Postpartum Severe Hypertension in Women with Underlying Chronic Hypertension.

To determine risk factors and time to diagnosis of postpartum severe hypertension (PHTN) in women with chronic hypertension (CHTN). Retrospective cohort of singleton pregnancies with CHTN at a tertiary care center. The primary outcome was PHTN, defined as hypertension ≥160/ ≥ 110 mm Hg during an emergency room (ER) or outpatient visit, or hospitalization within 8 weeks postpartum. Multivariable logistic regression was used to assess independent risk factors for PHTN. Two-hundred thirty-five women had CHTN: 30 (12.8%) were diagnosed with PHTN, and 17 (7.2%) were hospitalized or seen in the ER for PHTN. Women with PHTN had more severe superimposed pre-eclampsia ( PHTN occurred in 13% of women with CHTN, and was associated with blood pressure level and number of medications at discharge.

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