Serum creatinine and cystatin-C were lower in the mannitol group at 24 hours postoperatively ( creatinine , mannitol [ n = 43 ] ; 1.070.26 [ CI95 % : 0.99-1 .15 ] v controls [ n = 43 ] ; 1.200.30 [ CI95 % : 1.11-1 .30 ] ) , but not at 72 hours ( creatinine , mannitol [ n = 43 ] ; 1.130.29 [ CI95 % : 1.04-1 .22 ] v controls [ n = 43 ] ; 1.260.41 [ CI95 % 1.15-1 .38 ] ) .