Cardiopulmonary Changes Prolonged Surgical Abdominal Retractors Application in Supine Versus Lateral Position

Primary outcome; composite 1ry outcome \[1-Dynamic pulmonary compliance monitoring.2- Cardiac Index monitoring\] during and after surgical retractor application compared to the same variables reading prior retractor application and in between both groups. Secondary outcome: Static lung compliance, Cardiac output, Stroke volume SV - stroke volume variability (SVV)-Cardiac performance index, O2 delivery DIO2. Noninvasive Intraoperative hemodynamic (MBP, HR, O2 saturation)\] during and after surgical ring retractor application compared to the same variable reading prior retractor application and in between both groups.