7 Studies show that an increasing number of pregnant persons in the United States have chronic health conditions such as hypertension, 8,9 diabetes, 9-12 and chronic heart disease. While the contributions of hemorrhage, hypertensive disorders of pregnancy (i.e., preeclampsia, eclampsia), and anesthesia complications to pregnancy-related deaths declined, the contributions of cardiovascular, cerebrovascular accidents, and other medical conditions increased. The cause of death is unknown for 6.0% of all 2016–2018 pregnancy-related deaths. Other noncardiovascular medical conditions, 11.4%.Hypertensive disorders of pregnancy, 6.8%.Thrombotic pulmonary or other embolism, 9.4%.Other cardiovascular conditions, 16.2%.The graph above shows percentages of pregnancy-related deaths in the United States during 2016–2018 caused by: 1 Whether the actual risk of a woman dying from pregnancy-related causes has increased is unclear, and in recent years, the pregnancy-related mortality ratios have been relatively stable. However, errors in reported pregnancy status on death records have been described, potentially leading to overestimation of the number of pregnancy-related deaths. Identification of pregnancy-related deaths has improved over time due to the use of computerized data linkages between death records and birth and fetal death records by states, changes in the way causes of death are coded, and the addition of a pregnancy checkbox to death records. The reasons for the overall increase in pregnancy-related mortality are unclear. The graph above shows trends in pregnancy-related mortality ratios between 19 (the latest available year of data). Since the Pregnancy Mortality Surveillance System was implemented, the number of reported pregnancy-related deaths in the United States steadily increased from 7.2 deaths per 100,000 live births in 1987 to 17.3 deaths per 100,000 live births in 2018.
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