METHODS: Patients were submitted to conventional (n=15) or piggyback (n=17) liver transplantation (LTx). Free hepatic vein pressure (FHVP) and the central venous pressure (CVP) measurements were performed after graft reperfusion. Postoperative (PO) serum creatinine (Cr) was measured, acute renal failure (ARF) was defined as Cr > or = 2,0mg/dL and PO renal function was analyzed by modificated RIFLE-AKIN. PO overall Cr was calculated by area under the curve (AUC) of Cr vs. time. on the first week.