New Blood Filter Treatment Shows Promise for Preeclampsia Management

If you’re pregnant in Chicago this spring, the words “preeclampsia” might have started showing up in your Google searches more often than you’d like. It’s not just you—this dangerous pregnancy complication, marked by skyrocketing blood pressure and potential organ damage, affects up to 8% of pregnancies nationwide. And until now, the only surefire treatment has been delivering the baby, often weeks or even months early, leaving families scrambling between neonatal ICUs and the hope that their little one will catch up. But a new pilot study published this week in Nature Medicine is offering a glimmer of hope: a blood-filtering technique that could buy precious time for moms and babies in the most critical cases.

Here in Chicago, where nearly 35,000 babies are born each year at hospitals like Northwestern Memorial and the University of Chicago Medical Center, the stakes couldn’t be higher. Preeclampsia doesn’t just show up unannounced—it often arrives with a vengeance, disproportionately affecting Black women (who face a 60% higher risk than white women) and those with pre-existing conditions like diabetes or hypertension. For families on the South Side, where access to specialized maternal-fetal medicine can be limited, the news of a potential treatment feels like a long-overdue lifeline.

The Science Behind the Breakthrough

The study, led by Dr. Ravi Thadhani at Cedars-Sinai Medical Center in Los Angeles, focused on a protein called soluble Flt-1 (sFlt-1), which is produced by the placenta and plays a key role in regulating blood vessel growth. In women with preeclampsia, levels of sFlt-1 can spike to five times the normal amount, disrupting blood flow to the placenta and triggering the condition’s hallmark symptoms: dangerously high blood pressure, protein in the urine and in severe cases, liver damage or seizures (eclampsia).

Thadhani’s team tested a blood-filtering device—similar to those used in kidney dialysis—on 16 women diagnosed with severe early-onset preeclampsia. The device uses antibodies to latch onto sFlt-1 molecules and remove them from the bloodstream. The results? Modest but promising: participants saw a slight drop in blood pressure, and in some cases, pregnancies were extended by days or even weeks. “This represents the first time anyone has developed a targeted treatment for preeclampsia,” Thadhani told Scientific American. “We’re excited about the possibilities.”

For Chicago’s medical community, the implications are profound. Dr. Ann Borders, an obstetrician at NorthShore University HealthSystem who specializes in high-risk pregnancies, notes that while the study is modest, it’s a critical step forward. “Preeclampsia is one of the leading causes of maternal mortality, and in a city like Chicago, where we see significant racial disparities in maternal health outcomes, any tool that can help us manage this condition more effectively is worth exploring,” she says. (Borders was not involved in the study but has consulted on preeclampsia research in Illinois.)

Why This Matters for Chicago Families

Preeclampsia isn’t just a medical term—it’s a reality that touches thousands of Chicago families every year. Take the case of a 32-year-old mother from Englewood who, in 2024, developed severe preeclampsia at 28 weeks. Despite being admitted to Advocate Christ Medical Center, she was told her only option was an emergency C-section. Her son spent 47 days in the NICU, racking up medical bills that still haunt her. Stories like hers are why local advocates, like those at the Chicago Mothers’ Alliance, have been pushing for better access to experimental treatments and specialized care.

The new blood-filtering technique isn’t a cure, but it could be a game-changer for women like her. By lowering sFlt-1 levels, the treatment might delay delivery long enough for the baby’s lungs and other organs to mature, reducing the risk of complications like cerebral palsy or respiratory distress syndrome. And in a city where the infant mortality rate for Black babies is nearly three times higher than for white babies, every extra day in the womb counts.

Still, there are hurdles. The study’s sample size was small, and larger trials are needed to confirm the treatment’s safety and efficacy. There’s also the question of cost and accessibility. Dialysis-like treatments aren’t cheap, and in a city where Medicaid covers nearly half of all births, ensuring equitable access will be critical. “We can’t have a situation where only women with private insurance or those who can afford to travel to academic medical centers benefit from this,” says Dr. Melissa Simon, a professor of obstetrics and gynecology at Northwestern University Feinberg School of Medicine.

What’s Next for Local Hospitals?

Chicago’s top medical centers are already taking note. At the University of Chicago Medicine, researchers are exploring how to adapt the blood-filtering technique for broader employ. Meanwhile, at Rush University Medical Center, a team is studying whether the treatment could be combined with existing therapies, like magnesium sulfate (used to prevent seizures), to improve outcomes further.

For families navigating a preeclampsia diagnosis, the message is clear: help may be on the horizon. But in the meantime, local resources are available to bridge the gap. Here’s what Chicagoans should know:

The Local Resource Guide: Who to Turn to in Chicago

Given my background in maternal health advocacy, if preeclampsia—or the fear of it—is weighing on you, here are the three types of local professionals you’ll want to connect with:

Maternal-Fetal Medicine Specialists (MFMs)

What they do: These are obstetricians with advanced training in high-risk pregnancies. They can monitor your condition, adjust medications, and coordinate with neonatologists if early delivery becomes necessary. What to look for: Board certification in maternal-fetal medicine, experience with preeclampsia management, and affiliation with a hospital that has a Level III or IV NICU (like Lurie Children’s or Comer Children’s). Question about their approach to shared decision-making—you want a provider who will explain your options clearly, not just dictate a plan. Where to find them: Major academic medical centers (Northwestern, UChicago, Rush) and larger hospital systems (Advocate, AMITA Health).

Perinatal Social Workers

What they do: Preeclampsia doesn’t just affect your body—it takes a toll on your mental health, finances, and family dynamics. Perinatal social workers help with everything from navigating insurance appeals to connecting you with local support groups. What to look for: Licensed clinical social workers (LCSW) with experience in maternal health. Look for those who specialize in high-risk pregnancies or have worked with families in the NICU. Many are embedded in hospital systems, but some work independently. Where to find them: Ask your OB or MFM for a referral, or check with organizations like Postpartum Support International for Chicago-based providers.

Neonatal Intensive Care Unit (NICU) Navigators

What they do: If your baby is born early, a NICU navigator can be your lifeline. They help you understand medical jargon, coordinate visits, and even advocate for your baby’s care with the medical team. What to look for: Nurses or social workers with NICU experience, ideally those who’ve worked in Chicago’s busiest units (like at Lurie or Comer). They should be familiar with the city’s transportation challenges (e.g., getting from the South Side to Streeterville for daily visits) and local resources for families. Where to find them: Most Level III/IV NICUs have navigators on staff—ask to be connected as soon as you’re admitted.

One final note: if you’re pregnant and experiencing symptoms like severe headaches, vision changes, or sudden swelling, don’t wait. Chicago has a robust network of urgent care centers and labor & delivery triage units (like at Swedish Hospital or St. Bernard Hospital) where you can be evaluated quickly. Preeclampsia can escalate rapidly, and in this city, time is often the difference between a manageable complication and a crisis.

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