Significant respiratory dysfunction is a common problem after cardiac surgery, with an incidence of about 25%. the formation of atelectasis appears to be the primary factor responsible for increased intrapulmonary shunt after cardiac surgery with CPB. The investigators will use the lung ultrasound to evaluate the effects of intermittent recruitment of the lungs during CPB on extra vascular lung water (EVLW).~Objectives :~To evaluate the effect of intermittent lung recruitment during CPB in cardiac surgery on:~Lung ultrasound score (LUS),Oxygenation at different times postoperatively,Time for extubation and length of ICU stay~sixty patients aged from 18-60 years old, scheduled for elective cardiac surgery with CPB will be included in the study. Patients will be randomly allocated into one of two groups: Group A (n=30): will receive intermittent lung recruitment during CPB.Group B (n=30): control group.
The study is designed to use the lung ultrasound to assess the effect of intermittent lung recruitment during cardiopulmonary bypass in cardiac surgeries on extra vascular lung water.