Chronic Obstructive Pulmonary Disease (COPD) is known as the "silent killer" and has become the third leading cause of death in the world.

According to the latest data from the World Health Organization: Due to smoking, air pollution and other reasons, there are currently 600 million people worldwide suffering from COPD, and the prevalence is expected to continue to rise.

So, what is COPD?

COPD is a chronic respiratory disease characterized by incompletely reversible airflow limitation. The symptoms of COPD patients are mainly long-term coughing, sputum production and shortness of breath. When COPD develops to a severe degree, respiratory insufficiency, respiratory failure, pulmonary hypertension, pulmonary heart disease, right heart failure, etc. will often occur. symptom.