The goal of this prospective observational study is to report the duration of preoperative clear fluids fasting in patients undergoing liver transplant. It will also learn about the relationship between the duration of preoperative clear fluids fasting and changes in hemodynamic variables and metabolic profile at various anesthesia and transplant phases. The main questions it aims to answer are:

• How long liver recipient fast from clear fluids before liver transplant?
• Is there any relationship between the duration of preoperative clear fluids fasting and changes in blood pressure and hear rate after the induction of anesthesia?
• Is there any relationship between the duration of preoperative clear fluids fasting and blood glucose concentration, blood lactate concentration and acid base balance during anesthesia for liver transplant?

Clear fluids include water, certain juices without pulp (like apple or grape), clear sodas, tea or coffee without milk or cream, clear broth, sports drinks, gelatin, and popsicles without fruit pulp or yogurt.

Inclusion Criteria:

• patients scheduled for elective liver transplant

Exclusion Criteria:

• patients unable to give detailed answer on clear fluid fasting due to severe hepatic encephalopathy or cognitive impairment
• lack of written informed consent

Patients with liver diseases scheduled for elective liver transplant at University Clinical Centre of Medical University of Warsaw