Inclusion Criteria:  Patients aged 18-60 years. Model for end-stage liver disease (MELD) score 12-20. No severe hemodynamic instability. The liver donors aged 18-50 years and the sum of macro- and microvesicular hepatic steatosis has to be less than 30%.  Exclusion Criteria:  History of psychiatric/neurological illness. Cardiovascular disease. Hypertensive patients. Morbid obese patients (body mass index (BMI) > 35). Chronic obstructive pulmonary disease; pulmonary dysfunction (PaO2 less than 60 mmHg). Known allergic reaction to any of the study medications.