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Acute kidney injury in critically ill children: incidence and risk factors for mortality
Insights
Acute kidney injury (AKI) affects 4.4% of critically ill children. The need for dialysis emerged as a significant independent risk factor for mortality in these vulnerable patients.
Area of Science:
- Pediatric Intensive Care
- Nephrology
- Critical Care Medicine
Background:
- Acute kidney injury (AKI) is a frequent complication in critically ill children.
- AKI is associated with increased mortality rates in pediatric intensive care units (ICUs).
Purpose of the Study:
- To determine the incidence of AKI in critically ill children.
- To identify risk factors associated with mortality in pediatric ICU patients with AKI.
Main Methods:
- Prospective, observational study conducted in a pediatric ICU from 2005 to 2009.
- Inclusion of all patients with AKI, excluding specific conditions like chronic renal failure and newborns.
- Univariate and multivariate analyses were used to identify mortality risk factors.
Main Results:
- The incidence of AKI was 4.4% (66 out of 1496 patients).
- The overall mortality rate among patients with AKI was 44%.
- Anuria and the need for dialysis were significantly higher in deceased patients; dialysis was an independent predictor of mortality.
Conclusions:
- The incidence of acute kidney injury in critically ill children is 4.4%.
- The need for dialysis is an independent predictor of mortality in this population.
Introduction:
Acute kidney injury is a common complication associated with an increase in mortality in children who require intensive care. The objective of this study was to determine the incidence of acute kidney injury and identify risk factors for mortality in critically ill patients hospitalized in our facility.
Patients And Methods:
This was a prospective and observational study conducted at the Intensive Care Unit (ICU) of Hospital Pedro de Elizalde between 2005 and 2009. All patients with acute kidney injury were included, and those with chronic renal failure, prerenal acute kidney injury, hepatorenal syndrome, newborn infants, and postoperative cardiovascular surgery patients were excluded. The sample was divided into survivors and deceased patients so as to identify risk factors for mortality using univariate and multivariate analyses, taking their clinical characteristics as predictive variable, and death at the ICU as the outcome variable.
Results:
Out of 1496 patients, 66 developed acute kidney injury (4.4%). The cause was secondary in 72.8% of cases, and due to primary kidney disease in 27.2% of cases. Mortality rate was 44% (29 patients). The univariate analysis showed that the presence of anuria (p= 0.0003; OR: 7.01; 95% CI: 2.3-21.35) and the need of dialysis (p= 0.0009; OR: 6.35; 95% CI: 2.03-9.88) were signifcantly higher in deceased patients. The multiple regression analysis identifed that the need of dialysis (p = 0.0002; OR: 5.94; 95% CI: 1.85-19.04) was an independent risk factor for mortality.
Conclusions:
The incidence of acute kidney injury in critically ill children was 4.4%, and the need of dialysis was an independent predictor of mortality.
Related Concept Videos
Acute Kidney Injury I: Introduction
Acute Kidney Injury IV: Diagnostic Studies and Prevention
Acute Kidney Injury II: Pathophysiology
Acute Kidney Injury V: Interprofessional Care
Acute Kidney Injury III: Clinical Manifestations
Acute Kidney Injury VI: Nursing Management

