Respiratory and Hemodynamics Parameters Response to Positive End-Expiratory Pressure

"The 3rd \& 4th phases of operation in the group (A) and (B): Each patient received one single session inside the Operation Room (OR) as one shot of the treatment procedure. Arterial Blood Gases (ABGs) were obtained to measure:~1. Oxygenation by PaO2/FiO2 ratio with constant FiO2 = 100% (oxygen) through the procedure time as a primary outcome.~2. Secondary outcome.~ * Ventilation by PaCO2 value from ABGs.~ * Static compliance (Cstat) was measured as the amount of recruitment of alveoli in the lung.~ * Blood pressure (systolic/diastolic) one of the hemodynamics measurements was measured pre/post the procedure in the two groups."