Effect of Pressure-Controlled Volume Guaranteed Versus Volume-Controlled Ventilation Modes on Hemodynamic Outcomes e.g ( SV, CO ) and Respiratory Mechanics During Laparoscopic Abdominal Cancer Surgeries With Exaggerated Trendelenberg Postion

The primary outcome is to compare the hemodynamic outcomes ( e.g SV , CO and CI ) using The ICON of two different modes of ventilation ( VCV and PC-VG ) during laparoscopic abdominal cancer surgeries with exaggerated trendelenburg position. And the secondary outcomes is to compare the respiratory effects ( e.g atelectasis development , plateau pressure(Pplat) , peak inspiratory pressure(PIP) , dyn. compliance and postoperative inflammatory indicators e.g CRP and WBCs ) of two different modes of ventilation ( VCV and PC-VG ) during laparoscopic abdominal cancer surgeries with exaggerated trendelenburg position.

Inclusion Criteria: 1 - All patients who will be scheduled for elective laparoscopic abdominal cancer surgeries 2- patients aged 20-80 years 3- patients have an American Society of Anesthesiologists (ASA) physical status I-II Exclusion Criteria: 1 - Patients with severe systemic disease (history of myocardial infarction, chronic obstructive, or restrictive lung disease) 2- Obese patients (BMI \> 30) 3- patients with neurologic or neuromuscular diseases.