الفهرس 
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Abstract
Post-operative pulmonary complication represent a significant source of morbidity and have greater incidence and costs than cardiac complications alone. Atelectasis is the commonest one. Atelectasis may develop in nearly 90% of patients after general anaesthesia, persist up to several days. Oxygen therapy is usually given and use of pulse oximetry provide accurate objective measurement of oxygenation, continuous and non invasive prophylaxis against occurrence of postoperative atelectasis is the primary goal.