Pediatric Kidney Injury Hospitalizations Rose Tenfold Since 1997, New Study Finds

Acute kidney injury (AKI) in hospitalized children rose tenfold over 25 years, according to a retrospective study published in JAMA Network Open led by Alexander Kula, MD, MHS, of Ann and Robert H. Lurie Children's Hospital of Chicago.

The numbers are stark. Researchers analyzed more than 24.3 million discharges from the Healthcare Cost and Utilization Project Kids' Inpatient Database and found AKI rates climbed from 15.7 per 10,000 discharges in 1997 to 168.7 in 2022. Nationally, that translates to an estimated jump from 6,318 annual cases to 63,923, according to Newsy Today's breakdown of the data.

AKI severe enough to require dialysis (AKI-D) more than doubled, from 2.4 to 5.5 per 10,000 discharges, with annual national cases rising from 981 to 2,075.

The Death Rate Actually Fell

In-hospital mortality among AKI patients dropped sharply, from 1,814.0 per 10,000 hospitalizations in 2003 to 643.4 in 2022, per the study. Mortality among the sickest subset, those needing dialysis, held steady at roughly 25% the entire time.

So more kids are being diagnosed with kidney injury, but a smaller share of them are dying from it. Kula's team and an accompanying commentary from Laura Rangel Rodriguez, MD, of Cincinnati Children's Hospital Medical Center and David Selewski, MD, of Arkansas Children's Hospital both push back on reading the rising case count as evidence of declining care.

"Children with complex congenital heart disease, malignant neoplasms, transplants, and critical illness are surviving longer and being exposed to therapies and physiologic stressors that increase the risk of kidney injury," Rangel Rodriguez and Selewski wrote. Newsy Today's coverage of the study noted that the mix of underlying diagnoses shifted too. Malignancy accounted for 7.5% of primary diagnoses in 1997 versus 2.4% by 2022, while cardiovascular conditions and complex medical-technology dependence took a larger share.

Kula's team also credited improved recognition, coding changes, and wider availability of dialysis machines built for infants, rather than assuming the injuries themselves got more severe across the board.

Not Just an ICU Problem

Outside this specific study, broader pediatric nephrology literature cited by Archynewsy puts AKI incidence at 10% to 35% of general pediatric ICU admissions, climbing to 30% to 50% for infants and children undergoing cardiac surgery. Ward-acquired injury tied to nephrotoxic drugs like aminoglycosides is also a recognized risk outside intensive care. New tools like the Newcastle Infant Dialysis and Ultrafiltration System reflect the effort to build dialysis technology sized for small children rather than adapting adult machines.

The Environmental Argument

A separate but related debate is playing out over what's driving America's broader pediatric chronic disease trends. In a Daily Signal opinion piece, contributor Jay Richards credits HHS Secretary Robert F. Kennedy Jr. with elevating the idea that rising childhood obesity, diabetes, and other chronic conditions stem from a mismatch between modern lifestyles, ultra-processed food, seed oils, screen time, and the environment humans evolved for.

That's a legitimate argument worth taking seriously on its own terms, and it's central to the Make America Healthy Again push out of HHS. Neither Kula's team nor the accompanying JAMA Network Open commentary points to diet, seed oils, or screen time as drivers of the AKI increase. Their explanation centers on sicker kids surviving longer, better detection, and dialysis technology. That's an entirely different causal story than the one Richards lays out for chronic disease broadly. Applying the MAHA framework directly to this particular kidney injury data isn't something the study's own authors do.

What's Unresolved

The study's authors and commentators agree on one thing: AKI survivors face measurable long-term risks, including chronic kidney disease, hypertension, recurrent AKI, and cardiovascular complications, according to Rangel Rodriguez and Selewski. They're calling for more structured post-AKI surveillance and outpatient nephrology follow-up.

The catch is workforce capacity. Rangel Rodriguez and Selewski flagged existing shortages in pediatric nephrology as a barrier to scaling that kind of long-term monitoring just as the survivor population grows. Neither the study nor the commentary specifies how many additional pediatric nephrologists would be needed to meet that demand, leaving open exactly how hospitals plan to close the gap.