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Home Urology / Nephrology News

Starting dialysis after - not before - conception may improve birth rates in women with advanced kidney disease

by Urology Today
September 8, 2020
in Urology / Nephrology News
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Women with advanced kidney disease who start dialysis during pregnancy have superior live birth rates than those already on dialysis at the time of conception, according to a study appearing in an upcoming issue of the Clinical Journal of the American Society of Nephrology (CJASN). The findings provide valuable information for counseling women with kidney disease who are of child-bearing age.

During pregnancy and childbirth, women with chronic kidney disease (CKD) have a much higher risk of experiencing hypertension and worsening of kidney disease, and their babies are at increased risk of being born premature and having low birth weight. Rates of pregnancy loss are also higher. Often women with CKD are strongly discouraged from becoming pregnant due to such risks; however, recent efforts to provide more intense care and monitoring have improved outcomes in these high-risk pregnancies.

Shilpa Jesudason, MBBS, FRACP, PhD (Central and Northern Adelaide Renal and Transplantation Service, Royal Adelaide Hospital, in Australia) and her colleagues investigated the outcomes of pregnancies in women with advanced CKD who were receiving chronic dialysis treatment in Australia and New Zealand. In their study, women who conceived before starting dialysis (and then began chronic dialysis during the pregnancy) were compared with women who conceived after starting chronic dialysis.

The investigators analyzed all pregnancies reported to the Australian and New Zealand Dialysis and Transplantation Registry from 2001 to 2011, which included 77 pregnancies. Of these, 53 women conceived when they had already been established on dialysis, and 24 conceived before dialysis had commenced.

Among the major findings:

  The live birth rate was 73% overall, and 82% in pregnancies that reached 20 weeks of gestation (the mid-point of pregnancy).
  Compared with women who conceived after starting dialysis, women who conceived before starting dialysis had a much better live birth rate (91% vs 63%), but their infants were of similar birth weight and gestational age. The difference in live birth rate was due to higher rates of early pregnancy loss before 20 weeks in women who conceived while established on dialysis.
  In both groups, babies were likely to be premature (median gestational age 33.8 weeks) and of low birth-weight (median birth weight 3.86 pounds), which reflects the high-risk nature of these pregnancies.
  No babies died in-utero beyond 24 weeks gestation, more than 40% of pregnancies reached beyond 34 weeks gestation (when babies’ lungs can often breathe alone), extreme prematurity (born before 28 weeks) was only seen in 11.4% of pregnancies, and almost all babies survived beyond 28 days after birth.

“We can conclude that women with advanced kidney disease who start chronic dialysis after conception have superior live birth rates to those already established on dialysis at the time of conception, although these remain high-risk pregnancies,” said Dr. Jesudason. She noted that for a woman with advanced CKD, putting off a pregnancy until a kidney transplant is received is ideal, but it may take years for CKD to become severe enough to require a transplant, and there may be a long wait for a suitable donor organ. Therefore, women may not be able to receive a kidney transplant until their reproductive years have passed.

“With studies such as ours demonstrating improved outcomes for women with CKD who commence dialysis in pregnancy, there may be a shift in the way women are counselled regarding pregnancy on dialysis,” said Dr. Jesudason. “Our study provides information that can help counsel women with renal failure who want to get pregnant, or who become pregnant and want to make decisions about the pregnancy.”

###

Highlights

  Compared with women with advanced kidney disease who conceived after starting dialysis, women who conceived and then started dialysis during the pregnancy had a much better live birth rate (91% vs 63%), but their infants were of similar birth weight and gestational age.
  In both groups of women with kidney disease, babies were likely to be premature and of low birth-weight, which reflects the high-risk nature of these pregnancies.
  Pregnancy in women with advanced kidney disease is a rare, high-risk situation.

Study co-authors include Stephen McDonald MBBS, FRACP, PhD, and Blair Grace, PhD.

Disclosures: The authors reported no financial disclosures.

The article, entitled “Pregnancy Outcomes According to Dialysis Commencing Before or After Conception in Women With End-Stage Kidney Disease,” will appear online at http://cjasn.asnjournals.org/ on November 14, 2013, doi: 10.2215/CJN03560413.

The content of this article does not reflect the views or opinions of The American Society of Nephrology (ASN). Responsibility for the information and views expressed therein lies entirely with the author(s). ASN does not offer medical advice. All content in ASN publications is for informational purposes only, and is not intended to cover all possible uses, directions, precautions, drug interactions, or adverse effects. This content should not be used during a medical emergency or for the diagnosis or treatment of any medical condition. Please consult your doctor or other qualified health care provider if you have any questions about a medical condition, or before taking any drug, changing your diet or commencing or discontinuing any course of treatment. Do not ignore or delay obtaining professional medical advice because of information accessed through ASN. Call 911 or your doctor for all medical emergencies.

Founded in 1966, and with more than 14,000 members, the American Society of Nephrology (ASN) leads the fight against kidney disease by educating health professionals, sharing new knowledge, advancing research, and advocating the highest quality care for patients.

###

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