A lung transplant is a surgical process to remove a diseased lung and replace it with a healthy lung. The lung can be replaced partially or totally or together with heart.
Emphysema:This lung disease causes destruction of the fragile walls and elastic fibers of the alveoli. Small airways collapse when exhale, impairing airflow out of the lungs
Chronic bronchitis: In this condition, the bronchial tubes become inflamed and narrowed and the lungs produce more mucus, which can further block the narrowed tubes