Critical serum creatinine values in very preterm newborns

Area of Science:

• Neonatology
• Pediatric Nephrology
• Clinical Biochemistry

Background:

• Neonatal renal failure increases mortality and morbidity risks.
• Established critical values for serum creatinine in preterm infants are lacking.
• Early identification of renal dysfunction is crucial for improving outcomes.

Purpose of the Study:

• To establish critical serum creatinine (SCr) values based on gestational age in preterm infants.
• To evaluate SCr critical values as predictors of mortality and neurodevelopmental outcomes.
• To inform clinical practice regarding neonatal kidney function assessment.

Main Methods:

• Retrospective study of preterm infants (<33 weeks GA) hospitalized between 2003-2009.
• Serum creatinine levels measured between postnatal days 3-30.
• Critical values determined using the 90th percentile of highest SCr in infants with optimal neurodevelopment; validated against mortality and neurodevelopmental outcomes.

Main Results:

• 1,461 infants and 14,721 creatinine assessments analyzed.
• Critical SCr values established: 1.6 mg/dL (24-27 wks), 1.1 mg/dL (28-29 wks), 1.0 mg/dL (30-32 wks).
• Elevated SCr above critical values significantly associated with neonatal mortality (OR 8.55) and non-optimal neurodevelopment (OR 2.06).

Conclusions:

• Defined critical serum creatinine values serve as significant predictors for adverse outcomes in preterm infants.
• These values aid in identifying preterm neonates at high risk for mortality and neurodevelopmental impairment.
• Implementation of these critical values can enhance early detection and management of neonatal kidney injury.