This study aims to compare the effects of sodium acetate Ringer's solution versus sodium lactate Ringer's solution on early postoperative renal function indicators, renal injury biomarkers, and acute kidney injury (AKI) in elderly patients undergoing lumbar fusion surgery.
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Urinary neutrophil gelatinase-associated lipocalin (uNGAL)
Timeframe: Postoperative 6, 12, and 24 hours