Pregnant women on dialysis face a significantly elevated risk of severe maternal morbidity and new research indicates these complications can have lasting consequences for their kidney health and long-term survival. A study published in the Journal of the American Society of Nephrology reveals that over one-third of pregnant individuals receiving dialysis experience serious health issues during pregnancy and the postpartum period, with increased risks of mortality and reduced access to kidney transplantation years later.
The findings underscore a critical need for improved monitoring and comprehensive care for this vulnerable population. Researchers analyzed data spanning two decades to identify risk factors and long-term outcomes, highlighting disparities in care and the importance of specialized medical attention throughout the entire pregnancy journey. Understanding the impact of severe maternal morbidity on kidney outcomes is crucial for optimizing care and improving the lives of women with kidney disease who choose to become pregnant.
Increased Morbidity Rates Among Pregnant Dialysis Patients
The study, which examined data from the United States Renal Data System between 2000 and 2019, included 1,082 births among 986 women undergoing maintenance dialysis. Researchers found that 34% of these women experienced at least one severe maternal morbidity event, representing 32% of all births in the cohort. These events, defined using ICD codes established by the Centers for Disease Control and Prevention (CDC), included complications like blood transfusions (occurring in 16% of cases), pulmonary edema or acute heart failure (10%), sepsis (6%), and acute respiratory distress syndrome (5%).
Several factors were identified as increasing the risk of severe maternal morbidity. Black race was associated with a 33% increased risk (Relative Risk = 1.33; 95% Confidence Interval, 1.05-1.69), as was a body mass index (BMI) of 35 kg/m² or higher (RR = 1.28; 95% CI, 1.07-1.54). Women who began dialysis within one year of becoming pregnant also faced a heightened risk (RR = 1.27; 95% CI, 1.05-1.53), as did those with a pre-existing history of congestive heart failure (RR = 1.68; 95% CI, 1.34-2.11).
Long-Term Consequences for Kidney Health
The study’s findings extend beyond the immediate postpartum period. Women who experienced severe maternal morbidity had a 69% greater risk of mortality after delivery (adjusted Hazard Ratio = 1.69; 95% CI, 1.3-2.19) and were less likely to be listed for kidney transplantation (adjusted subhazard ratio = 0.76; 95% CI, 0.59-0.97). The 10-year survival rate for women who experienced severe maternal morbidity was 62%, significantly lower than the 77% survival rate observed in those without such complications.
“Clinicians should recognize that the risk of severe maternal morbidity in pregnant patients receiving dialysis is extraordinarily high — and this risk does not end at delivery,” said Monica L. Reynolds, MD, MSCR, associate professor of medicine at the University of North Carolina School of Medicine, and lead author of the study. “Our findings highlight the importance of sustained, comprehensive care: optimizing blood pressure, volume management, and anemia during pregnancy, ensuring timely transplant evaluation, and addressing cardiovascular risk factors after delivery.”
The Need for Interdisciplinary Collaboration
Researchers emphasize the importance of a collaborative approach to care, bringing together specialists in maternal-fetal medicine and nephrology. This collaboration can be fostered through cross-disciplinary training programs, such as the International Society of Nephrology Pregnancy and Kidney Disease Toolkit, and the establishment of joint clinics and multidisciplinary case conferences. These initiatives can help ensure proactive management of key issues like anemia, blood pressure control, and timely referral for kidney transplantation.
“Establishing joint clinics and regular multidisciplinary case conferences would allow teams to identify evolving risks and employ standardized care and safety checklists to ensure proactive management of anemia, blood pressure, transplant referral, and other key issues,” Reynolds explained.
The increasing recognition of the complex interplay between pregnancy and kidney disease underscores the need for continued research and improved clinical practices to optimize outcomes for this high-risk population. Further studies are needed to identify targeted interventions and strategies to mitigate the long-term health consequences of severe maternal morbidity in women on dialysis.
Disclaimer: This article provides informational content and should not be considered medical advice. Always consult with a qualified healthcare professional for diagnosis and treatment of any medical condition.
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