Intraoperative hypertension, defines as increase in mean arterial blood pressure (MAP) >= 25% of baseline for more than 1 min, with or without associated tachycardia (defined as HR value > 20% of the baseline value > 2 min) will be treated with IV boluses of fentanyl (1μg/kg). If blood pressure levels do not reach at least 20% of baseline levels after 5 min, slow intravenous administration of labetalol 20 mg will be considered. In the presence of hypotensive episodes (MAP decreased to <= 60 mmHg >= 2-3 min) and CVP < 8 mmHg, 5-7 ml/kg of 6% hydroxyethyl starch 130/0.4 will be given. In the presence of MAP ≤ 60 mmHg, and CVP > 10 mmHg, repeated bolus doses of ephedrine 5 mg will be given 5 min apart from each dose. Tachycardia ≥ 20% from the baseline values for ≥ 1 min will be treated with boluses of esmolol 20 mg.