Serum creatinine and cystatin-C were lower in the mannitol group at @ hours postoperatively ( creatinine , mannitol -LSB- n = @ -RSB- ; @ -LSB- CI@ % : @-@ @ -RSB- v controls -LSB- n = @ -RSB- ; @ -LSB- CI@ % : @-@ @ -RSB- ) , but not at @ hours ( creatinine , mannitol -LSB- n = @ -RSB- ; @ -LSB- CI@ % : @-@ @ -RSB- v controls -LSB- n = @ -RSB- ; @ -LSB- CI@ % @-@ @ -RSB- ) .