Maternal mortality is a public health crisis for all women, said Elizabeth A. Howell, MD, of the University of Pennsylvania, Philadelphia, in a presentation at the virtual Advancing NIH Research on the Health of Women conference sponsored by the National Institutes of Health.
The maternal mortality rate in the United States in 2018 was 17.4 maternal deaths per 100,000 live births, according to data from the Centers for Disease Control and Prevention, Dr. Howell said. Maternal mortality is defined as death during pregnancy or within 42 days of delivery; pregnancy-related mortality includes death during pregnancy or within 1 year of pregnancy, from pregnancy or as a result of any cause related to, or aggravated by, pregnancy, according to the CDC.
However, “Black women are two to three times more likely than White women to die from a pregnancy-related cause,” Dr. Howell said. These disparities are even more marked in some cities; data show that Black women in New York City are eight times more likely than White women to die from a pregnancy-related cause, she noted.
Pregnancy-related mortality persists regardless of education level, and remains significantly higher in Black women, compared with White women with at least a college degree, Dr. Howell added.
In her presentation, Dr. Howell reviewed some top causes of maternal mortality overall, and potential factors driving disparities. Data from the CDC show cardiomyopathy, cardiovascular conditions, and preeclampsia/eclampsia as the top three underlying causes of pregnancy-related deaths among non-Hispanic Black women, compared with mental health conditions, cardiovascular conditions, and hemorrhage in non-Hispanic White women, Dr. Howell said.
To help prevent maternal mortality across all populations, “It is important for us to think about the timing of deaths so we can better understand the causes,” said Dr. Howell.
CDC Vital Signs data show that approximately one-third of pregnancy-related deaths occur during pregnancy, but approximately 20% occur between 43 and 365 days postpartum, she said.
Although cardiovascular conditions top the list of clinical causes of pregnancy-related maternal mortality, maternal self-harm should not be discounted, and is likely underreported, Dr. Howell said. Data show that the peak incidence of maternal suicide occurs between 9 and 12 months’ postpartum, and risk factors include major depression, substance use disorder, and intimate partner violence, she noted.
Dr. Howell then shared the results of studies she conducted in 2020 and 2016 on racial disparities, hospital quality, and maternal mortality. One of her key findings in the 2020 study, presented at this year’s virtual meeting of the American College of Obstetricians and Gynecologists, showed that women delivering in the lowest-ranked hospitals had six times the rate of severe maternal morbidity, and an accompanying simulation/thought exercise showed that the hospital of delivery accounted for approximately half of the disparity in severe maternal morbidity between Black and White women. An earlier study she published in 2016 of between-hospital differences in New York City showed that Black and Latina women were significantly more likely than White women to deliver in hospitals with higher rates of severe maternal mortality.
These findings illustrate that “racial segregation in neighborhoods is also part of the story,” of maternal mortality, Dr. Howell said.
Dr. Howell outlined ways the health care community can reduce severe maternal morbidity and mortality for all women, including promoting contraception and preconception health, improving postpartum management, eliminating bias, and using patient navigators as needed to enhance communication among the care team,
“Think about ways to engage the community,” in support of women’s pregnancy health, Dr. Howell said. She also emphasized the need to enroll more pregnant women in clinical trials.