Conference Coverage

CKD, and even dialysis, may not be barriers to pregnancy



– Nephrologists are often uncomfortable with the idea of advising women with chronic kidney disease (CKD) about pregnancy, a physician told colleagues. They must do better, she said, with sensitivity and insight into once-extreme possibilities like pregnancy during dialysis.

“For many women, having a child is a life goal, and our women with chronic kidney disease are not different,” said Michelle Hladunewich, MD, of Toronto’s Sunnybrook Health Sciences Center. “When we don’t know what we should do, we tend to over-aggressively counsel our women, and that can traumatize them. It’s our role as nephrologists to help them find the safest window to have their pregnancy,” she said at the meeting sponsored by the American Society of Nephrology.

According to Dr. Hladunewich, there are tens of thousands of women of child-bearing age in the United States who have CKD, end-stage renal disease (ESRD), and kidney transplants. However, she said, research presented at Kidney Week 2018 suggested that many nephrologists do not feel confident about counseling patients regarding issues such as pregnancy outcomes in CKD. “We are not that comfortable with it, but we have to become more comfortable,” she said. “We need to be prepared to talk about contraception if they don’t want to have a child or the plan about how to have a child if they do.”

It’s especially important to understand that while women can fear birth defects and the exacerbation of their disease, they may also feel “they’re not fulfilling a societal norm to have a child like everyone else,” she said.

The risks of pregnancy in CKD can affect the mother (via worse kidney function) and/or the fetus (preeclampsia, poor fetal growth, preterm delivery).

In a 2015 study, Italian researchers compared 504 pregnancies in women with CKD to 836 low-risk pregnancies in women without CKD. They found that the risks of adverse outcomes increased in women at higher stages of CKD, compared with those at lower stages: “Renal function matters, and a stepwise increase in the risk of adverse maternal-fetal outcomes is observed from stage 1 to stages 4-5.”

In addition, the researchers noted that their research suggests “the presence of a baseline risk linked to CKD per se” (J Am Soc Nephrol. 2015 Aug; 26[8]:2011-22).

Dr. Hladunewich recommended focusing on “the safest window of opportunity.” Some patients will progress to end-stage renal disease, and an earlier pregnancy during CKD is a better option, she said. As a result, encouraging an earlier pregnancy can be a wise idea.

In some cases, though, a patient may be far into the stages of CKD. Dr. Hladunewich spoke about the case of a 31-year-old patient with a 29-year history of type 1 diabetes mellitus. She’d had one miscarriage, one preterm birth, and one twin pregnancy that was terminated because of safety concerns including rapid loss of kidney function.

The patient saw Dr. Hladunewich when she had a glomerular filtration rate of 25 mL/min, 3.5 g per 24 hour of proteinuria, and hypertension. The patient had a question: “Dr. Michelle, when can I try again?”

Dr. Hladunewich joked that “I had a small stroke.” But then, she said, “I got to the business of pregnancy counseling.”

She told the woman that her progression to end-stage renal disease was likely inevitable, and “adverse pregnancy outcomes were almost guaranteed.”

The woman responded: “Not now? When?” That, Dr. Hladunewich said, “was when I had my second stroke.”

But there is a possible solution: Pregnancy during dialysis. “Historically, we’ve said absolutely no pregnancy on dialysis,” she said, “but times are changing. We believe aggressive dialysis improves fetal maternal and fetal outcomes.”

Indeed, Dr. Hladunewich led a 2014 study that linked extensive dialysis during pregnancy (compared with less dialysis) to a better likelihood of outcomes such as live birth rate and normal birth weight (JASN May 2014;25[5]:1103-9).

As she noted, “we do offer it as a reproductive option” to patients like the one she mentioned – those who are in ESRD, approaching it, or are nearing the end of their child-bearing years with no transplant in sight. In transplant cases, she said, adequate graft function is linked to good pregnancy outcomes.

Dr. Hladunewich added that it’s important to monitor and adjust treatment of patients during the postpartum period. She said it’s especially important to understand the risks of drugs during breastfeeding. Both dialysis and transplant patients can breastfeed, she said.

Dr. Hladunewich reports no disclosures.

SOURCE: Kidney Week 2018, Abstract FR-OR078.

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