question: Compared to nothing what was the result of n-acetylcysteine for 7 days before the operation on Serum BUN level at 24th and 48 postoperative hour ?
context: Serum AST, ALT, ALP, CK-MB, and TnI levels demonstrated no significant difference between the 2 groups at any of the 4 measurement time points (preoperative, during cardiopulmonary bypass, 24th postoperative hour, and 48th postoperative hour) (p>0.05) (Table 2).