Biomarkers to Predict Acute Kidney Injury in Patients with Trauma.

Area of Science:

• Nephrology
• Trauma Medicine
• Biomarker Discovery

Background:

• Acute kidney injury (AKI) is a frequent complication in trauma patients, leading to increased morbidity and mortality.
• Early identification of patients at risk for AKI is crucial for timely intervention and improved outcomes.
• Urinary mitochondrial DNA copy number (mtDNAcn) is a potential biomarker for AKI, but its role in trauma patients is understudied.

Purpose of the Study:

• To evaluate the utility of urinary mitochondrial DNA copy number (mtDNAcn) as an early predictor of acute kidney injury (AKI) in trauma patients.
• To assess the association between baseline hemoglobin (Hb) levels and the development of AKI in this cohort.

Main Methods:

• A prospective observational study involving 65 trauma patients.
• Collection of serum and urine samples at baseline and at 24, 48, and 72 hours post-admission.
• Measurement of urinary and serum mtDNAcn using real-time polymerase chain reaction (PCR) and recording of clinical variables including Hb levels.

Main Results:

• 25 (38.5%) patients developed AKI.
• Patients with AKI had significantly lower Hb levels and higher urinary mtDNAcn at admission.
• Multivariate analysis identified low Hb and elevated urinary mtDNAcn as independent predictors of AKI, with optimal cutoffs of 10.95 g/dL for Hb and 738.0 copies/μL for urinary mtDNAcn.

Conclusions:

• Hemoglobin (Hb) and urinary mitochondrial DNA copy number (mtDNAcn) are independent biomarkers for early AKI detection in trauma patients.
• These findings suggest potential for improved AKI risk stratification in trauma populations.
• Further multicenter studies are needed to validate these biomarkers and establish optimal targets.