The objective of this observational clinical study is to evaluate the variations in ascorbic acid during the transplantation phases and how these variations influence the oxidative status and patient outcome. The main questions it aims to answer are: * how many patients arrive at the transplant in a state of hypovitaminosis C? * how does hypovitaminosis C affect the patient's oxidative status? * how does hypovitaminosis C affect the length of stay in intensive care and post-transplant complications?
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Ascorbic Acid levels
Timeframe: At induction of anesthesia for TX, within 24h from ICU admission, 72 hours after transplantation, 7 days after transplantation