Black Maternal Mortality: The Cardiovascular Conversation Nobody Has Before Discharge

A 28-year-old woman is discharged from the hospital two days after an uncomplicated vaginal delivery. Her blood pressure on the morning of discharge is 148/94. Nobody documents it as concerning. The discharge nurse reviews how to care for the newborn. Nobody mentions what to do if the patient cannot breathe lying flat two weeks from now.

The Mechanism

Pregnancy is the most sustained cardiovascular stress test most women will ever undergo. By the end of the third trimester, plasma volume has expanded by 40 to 50 percent above baseline, cardiac output has increased by 30 to 50 percent, and heart rate is elevated by 10 to 20 beats per minute. The heart works harder, longer, and against greater volume load than at any other point in a woman’s life outside of severe illness.

Most of the time, the healthy cardiovascular system manages this. Three things can go wrong in the postpartum period that are each capable of killing a woman who left the hospital alive and apparently stable.

The first is peripartum cardiomyopathy (PPCM). The physiology is specific: high circulating prolactin levels in late pregnancy are cleaved by the enzyme cathepsin D into a 16-kilodalton antiangiogenic fragment. This fragment damages the microvasculature of the myocardium. The heart muscle becomes ischemic at the microvascular level, contractile function falls, and the left ventricle dilates. Heart failure develops, typically in the final month of pregnancy or within five months of delivery. The woman feels breathless climbing stairs. She cannot sleep flat. Her ankles are swollen. She attributes it to having just had a baby. Her providers, if she sees them, may do the same.

Black women are more susceptible through several converging mechanisms. Higher baseline prevalence of hypertension means the heart enters pregnancy already under greater load. There are likely genetic variants affecting the prolactin cleavage pathway that increase susceptibility, though this research is still developing. And critically, structural barriers mean that by the time Black women with early PPCM reach a provider who takes their symptoms seriously, the disease has often progressed further than it would have in a woman whose concerns were addressed at first presentation.

The second mechanism is postpartum hypertension. This is a distinct clinical entity, not simply a continuation of gestational hypertension or preeclampsia. When the placenta is delivered, the high-volume, low-resistance circuit that sustained fetal circulation disappears. Over the following three to six days, the fluid that was distributed throughout the expanded plasma volume mobilizes back into the intravascular space. Blood pressure can spike dramatically in this window, even in women whose pressures were controlled during labor and delivery. If the woman is home with a new baby and no blood pressure monitoring, a systolic of 170 or 180 mmHg may be the silent background against which a stroke occurs.

The third mechanism operates at the level of chronic physiologic burden. Allostatic load, the cumulative biological cost of chronic stress exposure, is measurably higher in Black women at the population level. This is not a genetic predisposition. It is the biological signature of sustained exposure to structural racism, economic insecurity, and the cognitive and emotional labor of managing interactions with a medical system that consistently underestimates and undertreats Black women’s symptoms. Elevated allostatic load correlates with higher baseline cortisol, greater inflammatory markers, worse vascular endothelial function, and impaired capacity for cardiovascular recovery. It amplifies every physiologic vulnerability described above.

What the Evidence Shows

The CDC Morbidity and Mortality Weekly Report data from 2019 through 2021 found that Black women died of pregnancy-related causes at a rate of 69.9 per 100,000 live births, compared to 26.6 per 100,000 live births for White women, a 2.6-fold difference at the population level. 5 / Solid When broken out by age, the disparity widens: Black women aged 35 and older face pregnancy-related mortality rates more than three times those of White women in the same age group.

A joint report from the American College of Obstetricians and Gynecologists and the Society for Maternal-Fetal Medicine, drawing on CDC surveillance data, identified cardiovascular conditions as the leading cause of pregnancy-related death in the United States, accounting for approximately 26 percent of all maternal deaths. 5 / Solid This is not hemorrhage. It is not infection. Both of those causes are more immediately controllable in a hospital setting. Cardiovascular deaths happen largely in the outpatient window, in the weeks after discharge, when the woman is no longer under medical supervision.

The PPCM data are particularly striking. The Investigations of Pregnancy-Associated Cardiomyopathy (IPAC) registry, published by McNamara and colleagues in JAMA Cardiology, found overall PPCM incidence of approximately 1 in 1,000 live births in the United States. Black women accounted for a disproportionate share of the registry population and showed measurably worse outcomes: lower rates of left ventricular ejection fraction recovery at 12 months, higher rates of persistent cardiomyopathy requiring device therapy or transplant evaluation, and higher mortality. 5 / Solid Estimates from the IPAC registry and other cohorts place the PPCM incidence in Black women at five to six times the rate in White women. The prognosis gap persists after adjustment for presentation severity, pointing to differences in both disease biology and the care environment.

Work by Hameed and colleagues has documented the surveillance gap that makes postpartum hypertension so dangerous. Women are typically discharged 24 to 48 hours after vaginal delivery and 72 to 96 hours after cesarean delivery. The peak postpartum blood pressure rise occurs at days three through six. There is almost no formal clinical contact in that window for most women. Remote blood pressure monitoring programs, piloted in several health systems, have demonstrated that structured surveillance in the first two weeks postpartum catches hypertensive urgencies that would otherwise present as emergency department visits for stroke or seizure. 5 / Solid

The California Maternal Quality Care Collaborative analyzed statewide cardiovascular maternal deaths and found that approximately 60 percent were judged preventable by multidisciplinary case review panels. 5 / Solid The most common failure points were not technical or surgical. They were surveillance failures: symptoms not escalated, vital sign abnormalities not acted on, and discharge plans that did not include specific maternal monitoring instructions.

Creanga and colleagues, publishing in the American Journal of Obstetrics and Gynecology, examined the contribution of structural racism to the Black maternal mortality gap using multilevel modeling. Their findings showed that racial disparities in maternal mortality persisted after controlling for individual-level factors including income, education, parity, and comorbidity burden. The residual disparity was associated with structural determinants: hospital quality, neighborhood resources, and symptom dismissal in clinical encounters. 5 / Solid A Black woman presenting to the emergency department with dyspnea five weeks postpartum is statistically more likely to be discharged with a diagnosis of anxiety and less likely to receive echocardiography on that visit than a White woman with the same presentation.

Fett and colleagues developed a Self-Assessment Score for early PPCM symptoms, validated in a cohort of women with confirmed PPCM. The score uses six questions covering orthopnea, peripheral edema, palpitations, fatigue with exertion, cough, and dyspnea. A score of five or higher on a twelve-point scale was 100 percent sensitive for PPCM in the validation cohort. 5 / Solid The tool is not a substitute for echocardiography, but it provides a structured way for women to self-evaluate and a concrete threshold for seeking care rather than waiting.

What to Do This Week

1. Before leaving the hospital, ask for a written blood pressure action plan. Not verbal instructions. A written document that specifies: what medication you are being sent home on if any, what number on your home blood pressure monitor should prompt you to call the office, what number should prompt you to go directly to the emergency department, and when your follow-up appointment is. If your blood pressure at discharge is above 140/90, this plan is not optional. If nobody has provided it, use those exact words: “I need a written blood pressure action plan before I leave.”

2. Buy a validated home blood pressure cuff and use it. The American Medical Association and the American Heart Association both publish lists of validated devices. A validated upper arm cuff costs between 30 and 60 dollars and is covered by many insurance plans. Use it in the morning and evening for at least the first two weeks after delivery. Sit quietly for five minutes before measuring. Record the readings. The thresholds that warrant a call to your provider: systolic at or above 150 mmHg, or diastolic at or above 100 mmHg, on two readings taken 15 minutes apart. The threshold for going directly to the emergency department without calling first: systolic at or above 160, or any neurologic symptom (severe headache, visual changes, confusion) alongside an elevated reading.

3. Know which cardiac symptoms require emergency evaluation, not a call in the morning. The following are not symptoms to monitor at home: inability to lie flat to sleep (orthopnea), shortness of breath at rest or with minimal exertion such as walking across a room, chest pain or pressure, palpitations with lightheadedness or near-fainting, or leg swelling that appeared rapidly and is asymmetric. These require emergency department evaluation the same day they occur, regardless of the hour. The PPCM presentation window is the first five months postpartum, not just the first two weeks.

4. If you had preeclampsia, gestational hypertension, or HELLP syndrome, ask specifically for a cardiology or maternal-fetal medicine referral within six weeks of delivery. Do not wait for your obstetrician to raise this. Use the specific language: “Given my diagnosis of preeclampsia, I would like a referral to cardiology or MFM to discuss my long-term cardiovascular risk and follow-up plan.” If you are told this is unnecessary, ask for the reasoning to be documented in your chart. Women with severe features of preeclampsia have a lifetime cardiovascular risk that warrants active surveillance.

5. If you develop exertional breathlessness or orthopnea in the first five months postpartum, bring the Fett Self-Assessment Score to your appointment. The six-question tool is publicly available and takes under two minutes to complete. It covers orthopnea, peripheral edema, palpitations, fatigue with exertion, cough, and dyspnea. Bring the completed score to your provider as clinical information. A score of five or above warrants echocardiography. Ask whether a BNP has been ordered, and whether cardiology consultation is available.

The woman who leaves the hospital with a blood pressure of 148/94 and no written plan, who develops dyspnea at week three and attributes it to fatigue, who attends a six-week visit where the cardiovascular conversation never happens, and who presents to the emergency department at week eight in decompensated heart failure is not a story of bad luck. She is the story of a care system that structured its post-delivery surveillance around the newborn and left the mother unmonitored in the highest-risk window of her cardiovascular life. The conversation before discharge is not complicated. It just has to actually happen.

Related reading

For the full picture of cardiovascular disparities in Black women: 59% of Black Women Have Cardiovascular Disease. Here Is the Clinical Reality.

For the PPCM mechanism and all women’s peripartum risk: MINOCA: The Heart Attack With Normal Arteries.

For the long-term cardiac consequences of preeclampsia, see the pregnancy cardiac stress test module.