A Rough Road Ahead

Last month, a baby came into the world without kidneys. This is not generally a topic for news coverage (it happens more often than you think), but this girl’s mother is U.S. Rep. Jaime Herrera Beutler. Despite prenatal warnings about the grave prognosis, the Representative chose to continue her pregnancy with periodic intrauterine saline infusions. The fluid substitutes for fetal urine in utero, allowing better lung development and preventing the deformities induced by uterine compression in the absence of amniotic fluid.* This procedure has been used since the 1990s with variable success.

Abigail, the infant, was born prematurely, at 28 weeks of gestation and a weight of 2 lb 2 oz. A baby this premature has a hard road ahead of her, even if everything else is normal. Having no kidneys just makes things that more complicated.

Two studies examined single-center prognosis for infants on chronic dialysis, generally peritoneal dialysis (treatment the Beutler child is undergoing). One from Miami examined all chronic dialysis patients who started treatment in the first year of life. Of 52 patients, 20 (38%) died in the first year of life, mostly within the first month of life. Over up to 25 years of observation, the mortality totaled 54%. They did not report the gestational age of their patients, and no child was reported to be completely anephric.

The other study came from the University of Minnesota. It examined only infants started on peritoneal dialysis before 28 days of age (23 babies). Gestational age in this series ranged from 31-40 weeks (average 37 weeks) with 39% considered premature (<17 weeks of gestation). Survival at 1 year was 52%, with half of the deaths occurring before the infant could be discharged to home. Once again, no infant with complete absence of kidneys was reported.

Both studies confirm that getting these kids to an appropriate size for transplant (~10 kg body weight, generally at 15-18 months of age) can be a battle. Most children suffered infections and other problems leading to hospitalizations during that period. The Minnesota groups averaged 6 admissions each in the first year of life after neonatal discharge (average discharge occurred after 3 months of hospitalization, so those 6 re-admissions occurred within a 9-month period).

These infants also require support beyond dialysis and medications. Forced feedings via a tube were required in 94% of babies discharged on home dialysis in the Minnesota series.

The good news is that once these children get to transplant, they generally do as well as other children with end-stage kidney failure. Patient survival remains stable after 2 years of age, and the 5-year transplant graft survival rate is 83%, similar to that of older children transplanted in the same era.

Both of the studies discussed here started with infants on dialysis; we do not know how many parents chose not to pursue aggressive treatment for their critically ill offspring

Peritoneal dialysis allows us to save about half of the infants whose kidneys fail in the first months of life. However, these children often have multiple admissions over that first year of life, and they will be technology-dependent for their entire lives. All of these factors need to be weighed by the parents before embarking on infant dialysis. .

*Use of this illustration for 1 year online would cost me $282; click over to the Netter Illustration and view it with the watermark. You will get the general idea.