Updated Guidelines for Detecting High Blood Pressure in Pregnancy

Study Overview

Recent research indicates that updated guidelines for identifying high blood pressure may enhance diagnoses of pregnancy-related hypertension. High blood pressure during pregnancy poses significant risks for both mothers and their infants. Notably, both chronic and gestational hypertension contribute to approximately 14% of maternal mortality rates globally.

Risks Associated with High Blood Pressure

Mothers affected by high blood pressure face various complications, and their infants are at a heightened risk for low birth weight and long-term cardiovascular issues. Current guidelines categorize gestational hypertension as a diagnosis when blood pressure readings exceed 140 mm Hg for systolic blood pressure (SBP) or 90 mm Hg for diastolic blood pressure (DBP).

Changes in Blood Pressure Guidelines

In 2017, the American College of Cardiology (ACC) and the American Heart Association (AHA) revised their high blood pressure diagnostic thresholds for adults, defining hypertension as SBP/DBP readings above 130/80 mm Hg. However, these revisions did not extend to the diagnosis of gestational hypertension.

Research Methodology

To assess the impact of the ACC/AHA’s new guidelines on identifying high blood pressure in pregnant women, researchers from Brigham and Women’s Hospital conducted an extensive study involving over 16,000 women who delivered between September 2012 and October 2016 in Wuhan, China. The study analyzed medical records, including blood pressure measurements, liver and kidney function tests, and neonatal outcomes such as birth weight and gestational age.

Key Findings

The study’s findings were published in the journal Circulation Research. The application of the 2017 ACC/AHA guidelines revealed that 25.1% of participants, equating to 4,100 women, were diagnosed with high blood pressure. This starkly contrasts with the 4.2%, or 678 women, identified under the previous guidelines.

Importance of Accurate Diagnosis

Lead researcher Dr. Jie Hu emphasized the significance of timely and accurate diagnosis of gestational hypertension to prevent related conditions, such as preeclampsia and postpartum chronic hypertension. He noted that infants born to mothers with gestational hypertension are more vulnerable to preterm births and adverse long-term health outcomes, including cardiovascular diseases in young adulthood.

Recommendations for Practice

The researchers advocate for the integration of the 2017 ACC/AHA guidelines into prenatal care practices. Dr. Hu stated that this approach could enhance the detection of high blood pressure during pregnancy and ultimately reduce adverse outcomes for both mothers and newborns linked to gestational hypertension.

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Reference

Hu J, Li Y, Zhang B, Zheng T, Li J, Peng Y, Zhou A, Buka SL, Liu S, Zhang Y, Shi K, Xia W, Rexrode KM, Xu S. Impact of the 2017 ACC/AHA Guideline for High Blood Pressure on Evaluating Gestational Hypertension-Associated Risks for Newborns and Mothers. Circ Res. 2019 Jul 5;125(2):184-194.