Perioperative Acute Renal Injury: Revisiting Pathophysiology.

Area of Science:

• Nephrology
• Cardiology
• Biomarker Discovery

Background:

• Acute kidney injury (AKI) after cardiac surgery leads to high mortality.
• Early detection of AKI is crucial for timely intervention but lacks reliable biomarkers.
• Urinary neutrophil gelatinase-associated lipocalin (NGAL) shows promise as an early AKI indicator.

Purpose of the Study:

• To investigate whether postoperative urinary NGAL concentrations are elevated in adult patients who develop AKI after cardiac surgery.
• To assess the potential of urinary NGAL as an early diagnostic marker for AKI in this patient population.

Main Methods:

• Prospective study of 81 adult cardiac surgery patients.
• Urine samples collected pre- and post-surgery for NGAL analysis.
• AKI defined as a ≥50% increase in serum creatinine post-surgery.

Main Results:

• 20% of patients (16/81) developed AKI.
• Significantly higher urinary NGAL levels observed in AKI patients at 1, 3, and 18 hours post-surgery (p < 0.01).
• Urinary NGAL levels decreased rapidly in patients without AKI.

Conclusions:

• Elevated urinary NGAL concentrations early after cardiac surgery are associated with AKI development.
• Urinary NGAL is a potential sensitive and early biomarker for detecting AKI post-cardiac surgery.
• Early detection via urinary NGAL may enable timely interventions to prevent progression to acute renal failure.