sentences:  This has been shown to be beneficial in the treatment of emphysema, where lungs lose their elasticity and thus cannot contract sufficiently to exhale air, leading to air trapping and hyperinflation.When one or more diseased portions of an emphysematous lung are made to deflate and collapse, other healthier portions of the lung have more room in the chest cavity to inhale and exhale, pressure is removed from the diaphragm, and even the heart may function better as the hyper-inflated lung becomes smaller.The amount of residual volume reduction achieved, correlates with the effects on FEV1, quality of life and exercise capacity.