The aim of this book is to present state-of-the-art information regarding the disease of emphysema. Emphysema is one of the primary types of chronic obstructive pulmonary disease (COPD). This book presents a descriptive account of emphysema elucidating its theory as well as applications. A broad spectrum of topics regarding this disease are encompassed in this profound book including the role of alpha-1 antitrypsin in this disease, combined pulmonary fibrosis and emphysema, endoscopic lung volume reduction, etc. It is intended for a wide range of readers who are interested in gaining advanced knowledge regarding this disease.