Introduction:

There are few studies on acute kidney injury (AKI) in preterm infants; currently, there are no criteria for its definition and management.

Objective:

To determine the incidence of AKI in preterm infants hospitalized in a neonatal care unit (NICU).

Material and methods:

Descriptive cohort study of newborns weighing ≤ 1,500 grams admitted to the NICU of a university hospital in Bogotá, over a period of one year. All the patients were sampled serum creatinine at 24 and 72 hours of life. ARI was defined as an increase of creatinine ≥ 0.3 mg/mL or increased 150% of the initial value.

Results:

53 patients were included. Eleven patients were excluded because they died before 72 hours after birth. Ten patients met the definition of ARI and correspond to an incidence of 23.8% (95% CI 11.7 to 34.6%). There were three cases that also presented oliguria.

Conclusions:

Our definition shows a high incidence of AKI in premature newborns. More studies are needed to confirm these findings and establish risk factors associated with AKI.

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