Study will be conducted on 20 patients ASA III-IV undergoing orthotopic liver transplantation. Blood samples will be obtained simultaneously from arterial line, pulmonary artery catheter and central venous catheter at 4 specific time points baseline, immediately after insertion of PAC; at the end of the dissection phase; 30 minutes after anhepatic phase; 30 minutes after unclamping. Blood samples will be also obtained whenever PPV is more than 15% and patient will need fluid therapy
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correlation between the PPV(pulse pressure variation) and Pcv-a CO2 (central venous to arterial) gap
Timeframe: baseline 5 min after induction of anesthesia, immediately after insertion of PAC; 30 minutes after the dissection phase; 30 minutes after anhepatic phase; 30 minutes after unclamping