الفهرس 
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Abstract
Background:
Included the anatomical description of the lung and the physiological aspects . Risk factors and their mechanisms to produce chronic obstructive pulmonary disease are also mentioned . It also included the clinical picture, investigations and different treatment modalities.
Objectives :
To evaluate the role of lung volume reduction surgery in the treatment of chronic obstructive pulmonary disease .
Methods :
Included history taking , clinical examination, laboratory investigations , radiological examination, spirometry, arterial blood gases measurement , electrocardiogram and echocardiography . It also included the steps of operative intervention in the first group (diffuse emphysema) and in the second group (bullous emphysema) and the pathological examination of the excised specimens .
Results:
The were significant improvement in both groups as regards the clinical condition (transitional dyspnea index), the radiological improvement in the both plain X- ray and computerized tomography of the chest, the pulmonary function tests , arterial blood gases and echocardiographic parameters.
Conclusion:
Lung volume reduction surgery is a successful operation in alleviating symptoms of patients .