Effect of Fluid Therapy on Acid-Base Balance in Patients Undergoing Clipping for Ruptured Intracranial Aneurysm: A Prospective Randomized Controlled Trial.

Neurosurgical patients often receive 0.9% normal saline (NS) during the perioperative period. Theoretically, a balanced salt solution (BSS) is better than 0.9% saline. We compared the effects of two different fluids on acid-base balance, renal function, and neurological outcome in patients who underwent clipping following subarachnoid hemorrhage from a ruptured intracranial aneurysm.  Patients in group NS (  = 30) received 0.9% saline and group BSS (  = 30) received BSS (Plasmalyte-A) in the perioperative period for 48 hours. Comparison of arterial pH, bicarbonate, and base deficit measured preoperatively, intraoperatively (first and second hour), and postoperatively (at 24 and 48 hours) was the primary outcome of the study. The secondary outcome compared serum electrolytes, renal function tests, urine neutrophil gelatinase-associated lipocalin (NGAL), serum cystatin C, and the neurological outcome using modified Rankin score (MRS) at discharge, 1, and 3 months.  In group NS, significantly low pH at 1-hour intraoperative period was seen compared with group BSS (7.37 ± 0.06 vs. 7.40 ± 0.05,  = 0.024). The bicarbonate level in group NS was significantly lower and the base deficit was higher at second intraoperative hour (bicarbonate: 17.49 vs. 21.99 mEq/L,  = 0.001; base deficit: 6.41 mmol/L vs. 1.89 mmol/L,  = 0.003) and at 24 hours post-surgery (bicarbonate: 20.38 vs. 21.96 mEq/L,  = 0.012; base deficit: 3.56 mmol/L vs. 2.12 mmol/L,  = 0.034)). Serum creatinine was higher in group NS at 24 hours (0.66 vs. 0.52 mg/dL,  = 0.013) and 48 hours (0.62 vs. 0.53 mg/dL,  = 0.047). Serum urea, electrolytes, cystatin, urine NGAL, and MRS were comparable.  In neurosurgical patients undergoing clipping for ruptured intracranial aneurysm, using a BSS during the perioperative period is associated with a better acid-base and renal profile. However, the biomarkers of kidney injury and long-term outcomes were comparable.