Post operative lung collapse is a common post operative complication after major abdominal Surgery it is due to many factors like inadequate pain relief, inadequate physiotherapy, inabilty to clear secretions.

In this study we will use ultrasound which a common scanning used in post operative period and assess the degree of lung collapse using lung ultrasound and give it a score after dividing the lung into 6 quadrants and we will check for degree of lung collapse at 3 different time intervals 2-3 hrs after admission to recovery, next morning after admission/12 hrs after admission to the recovery room, just prior to discharge to ward if the patient stays for more than 12 hrs in recovery room . in patients with lung collapse just after admission to recovery we will see the degree of change in lung collapse. This will help us assess whether our post operative care like pain relief, chest physiotherapy is adequate for the patients in post operative period or do they need improvement.