The study is interventional, non-pharmacological, single-center. The aim of this study is to test the possible added value of CRRT in the surgery room during liver transplantation, compared to the investigators center current practice in which CRRT is suspended and possibly restarted at the end of the operation. The incidence of some clinical and metabolic alterations that often complicate transplantation in the absence of CRRT will be evaluated, by measuring a series of parameters related to the state of water filling, acid-base balance, general metabolic structure, hemodynamics and supportive drugs. Some parameters related to patient safety will be evaluated. The results of this exploratory study will be useful to document what was rationally hypothesized, that is, that the continuation of dialysis treatment even during the hours of surgery, in this narrow category of patients, is actually useful to reduce the possible clinical and metabolic complications, intra- and/or post-operative (within 48 hours of transplant), linked to the simultaneous presence of renal failure. The statistical analysis is aimed at analyzing the behavior of different indicators of clinical complications and comparing them with what was found in the historical series, in the hypothesis that with the new procedure the analyzed parameters are better. In detail, the mean values at the end of treatment will be compared for: * Central venous pressure * Potassiemia * Lactatemia * pH The following will also be evaluated: * dose of vasoconstrictor drugs, defined by the variation between the dose at the beginning of administration during the anhepatic phase and the maximum dose reached * pulmonary congestion/pulmonary edema, defined by radiological signs of alveolar congestion/edema on chest X-ray in the post-surgery period * safety parameters: episodes of hypokalemia requiring supplementation (K\<3.5 mmol/l), post-surgery hypophosphatemia, number of coagulation events in the extracorporeal circuit, appearance of cardiac arrhythmias.
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central venous pressure average values at the end of treatment
Timeframe: during surgery
Potassiemia average values at the end of tretment
Timeframe: during surgery
Lactatemia average values at the end of treatment
Timeframe: during surgery
pH average values at the end of treatment
Timeframe: during surgery