Intraoperatory Hemodynamic Monitoring in OLT

The goal of this clinical trial is to compare two different hemodynamic monitoring techniques during orthotopic liver transplantation. The main question it aims to answer is: if using a different hemodynamic monitoring might help reducing the intraoperative hypotension time. Participants will be randomized to one of two arms of hemodynamic monitoring: * conventional monitoring with pulmonary artery catheter * monitoring with transesophageal echocardiography Researchers will compare the two groups to see if there is any difference in the intraoperatory hypotension time and in secondary outcomes such as organ dysfunctions or mortality.