From the Journals

AKI seen in 64% of children hospitalized with diabetic ketoacidosis

Publish date: March 13, 2017

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Implications for fluid management in children with AKI

With the lack of targeted therapies to prevent AKI or decrease its associated consequences, supportive care is the mainstay of treatment and focuses on fluid and electrolyte management, nutrition, prevention of further injury through close attention to medication dosing, and, when needed, renal replacement therapy. At first glance, these findings may not appear to be overly surprising or significant; children with volume depletion have decreased renal blood flow, leading to AKI, which corrects with fluid administration. However, the authors appropriately suggest that this issue is not a simple one and that fluid management should be carefully considered in these patients. Because of severe hyperglycemia and derangements in serum sodium concentration, children with DKA are at risk of potentially catastrophic cerebral edema, leading to recommendations for cautious administration of fluids in this high-risk population.

These findings may lead clinicians and investigators to question established practices related to aggressive fluid administration in the sickest children. While awaiting more research to determine the sweet spot for fluid management in children with AKI, it seems reasonable to give fluids to patients with AKI secondary to volume depletion while quickly shifting to more restrictive strategies in those who do not respond to volume and have decreasing urine output. This may be especially important for children with DKA, as conservative fluid management may decrease central nervous system complications.

We commend the authors for exploring AKI in a novel pediatric population, expanding our knowledge on whom kidney function should be more diligently examined, providing insights on relevant fluid strategies, and increasing awareness for a group of patients who may benefit from closer long-term nephrology follow-up.

Benjamin L. Laskin, MD , is at the Children’s Hospital of Philadelphia, and Jens Goebel, MD , is at Children’s Hospital Colorado, Aurora. Dr. Laskin’s and Dr. Goebel’s comments are excerpted from an editorial accompanying the study by Hursh et al. (JAMA Pediatr. 2017 Mar 13. doi: 10.1001/jamapediatrics.2017.0009). Dr Laskin is supported by a National Institutes of Health grant. The editorialists had no other relevant financial disclosures.

FROM JAMA PEDIATRICS

A high proportion of children with type 1 diabetes who are hospitalized for diabetic ketoacidosis (DKA) develop acute kidney injury (AKI), according to results from a study.

Researchers reviewing records from a Canadian hospital found that in a cohort of 165 children hospitalized for DKA during a 5-year period (2008-2013), 64% developed the complication. Severe forms of AKI (stage 2 or 3) were common, representing 45% and 20%, respectively, of children with AKI. Two patients in the cohort required dialysis.

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In their research published online March 13 in JAMA Pediatrics, Brenden E. Hursh, MD, and his colleagues at the University of British Columbia and the British Columbia Children’s Hospital, both in Vancouver, noted that AKI rates among hospitalized children had not been systematically studied before.

“We hypothesized that, because DKA is associated with both volume depletion and conservative fluid administration upon presentation, these children are potentially at high risk for AKI, above the level of risk expected by the rare reported cases in the literature,” Dr. Hursh and his colleagues wrote (JAMA Pediatr. 2017 Mar 13. doi: 10.1001/jamapediatrics.2017.0020).

The investigators found that lower serum bicarbonate levels and elevated heart rates were indeed associated with increased risk of severe AKI. Serum bicarbonate level of less than 10 mEq/L was associated with a fivefold increase in the odds of severe (stage 2 or 3) AKI (adjusted odds ratio, 5.22; 95% confidence interval, 1.35-20.22). Each increase of 5 bpm in initial heart rate was associated with a 22% increase in the odds of severe AKI (aOR, 1.22; 95% CI, 1.07-1.39).

Dr. Hursh and his colleagues defined AKI using serum creatinine values. As baseline values prior to hospital admission were not available, the researchers used estimated normal value ranges from published studies, choosing a glomerular filtration rate of 120 mL/min per 1.73 m² as a standard baseline value. Urine output was not used as a measure because of inconsistent records.

Of particular concern was that more than 40% of patients with AKI “did not have documented resolution of AKI prior to discharge or arrangements for follow-up in the nephrology clinic. Of note, the final AKI stage was severe for 50% of these children,” the researchers wrote in their analysis.

The findings suggest that clinicians “should consider AKI as a frequent complication that accompanies pediatric DKA and should be especially alert to its presence in severe presentations of DKA,” they said. AKI is underrecognized “both because of a lack of awareness of AKI as a complication of DKA and because the serum creatinine level in pediatric patients must be interpreted in the context of the child’s age and height. It is crucial to develop or have in place systems that identify and monitor abnormal markers of renal function in this population.”

The researchers acknowledged as limitations of their study its retrospective design, the absence of baseline serum creatinine values, and the lack of urine output data for use in AKI severity grading. And prospective longitudinal studies, they wrote, “are needed to assess the effect of these AKI episodes on the trajectory of renal disease in children with diabetes.”

The researchers reported no outside funding or relevant financial disclosures.

AKI seen in 64% of children hospitalized with diabetic ketoacidosis

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