UC research finds pregnancy in kidney transplant recipients increases risk of adverse maternal and fetal outcomes

Pregnancy in kidney transplant recipients is associated with adverse outcomes, according to new research from the University of Cincinnati (UC). The study, published online in the Jan. 23, 2019 edition of BMC Nephrology, finds that pregnancy in kidney transplant recipients is associated with higher risk of adverse maternal and fetal outcomes.

“Given that pregnancy in kidney transplant recipients can be challenging due to risks associated with immunosuppression and kidney allograft dysfunction, our study focused on pregnancy outcomes in women of child-bearing age who are kidney transplant recipients,” says Silvi Shah, MD, assistant professor, Division of Nephrology, Kidney CARE Program at the UC of Medicine, and lead author of the study.

Shah and her team analyzed 87 studies that included 6,712 pregnancies in 4,174 kidney transplant recipients. A quantitative meta-analysis was performed, and the pooled incidence of various maternal and fetal pregnancy outcomes was calculated.

The study showed significant higher rates of preeclampsia (21.5 percent), cesarean section (62.6 percent), and ectopic pregnancy (2.4 percent) in kidney transplant recipients as compared to the U.S. general population.

“Reproductive function in women with end stage kidney disease generally improves after kidney transplant,” says Shah. “What our study findings tell us is that pregnancy in kidney transplant recipients is associated with higher risk of adverse maternal outcomes. We have to consider these associated risks when we counsel women of child bearing age with kidney transplant who are contemplating pregnancy.”

In regard to the fetal outcomes, the study showed higher rates of preterm births, still births (5.1 percent), and neonatal mortality (3.8 percent) in kidney transplant recipients as compared with national data in general population. The mean gestational age for newborns was 34.9 weeks (U.S. mean, 38.7 weeks) and the mean birth weight was 2,470 grams (U.S. mean, 3,389 grams).

“Pregnancy in kidney transplant recipients is associated with high risk of adverse fetal outcomes,” says Shah. “It’s very important when a woman who has a kidney transplant gets pregnant, she is followed by a multi-disciplinary team, including a gynecologist, a nephrologist and a neonatologist working together through the pregnancy.”

The study was supported by the UC College of Medicine Health Sciences Library Grant. The other co-authors of the study include Tiffany Grant, PhD and Emily Kean from the Health Sciences Library, Prasoon Verma, MD, from Cincinnati Children’s, Renganathan Lalgudi Venkatesan, Ayank Gupta and Maitrik K. Sanghavi from UC College of Business, Richard Johansen from the UC libraries, Anu Gupta, MD from Buffalo Medical Group, Taranpreet Kaur, MD, from the Division of Nephrology, Kidney CARE Program, and Jeffrey Welge, PhD, from Department of Environmental Health, both in the UC College of Medicine.