Patients with chronic obstructive pulmonary disease (COPD) often have many other comorbidities such as cardiovascular disease, osteoporosis, diabetes, lung disease, digestive disease, etc. Among them, chronic heart failure and coronary artery disease are the most common diseases, making treatment difficult.

Chronic obstructive pulmonary disease (COPD) is a disease that causes chronic airflow obstruction in the lungs, leading to a number of comorbidities, including osteoporosis.

Chronic obstructive pulmonary disease (COPD) can cause serious and life-threatening consequences because the disease is often accompanied by comorbidities.

Plethysmography is a method of measuring total lung capacity using a plethysmography chamber. Plethysmography is used to confirm restrictive ventilation disorders and to differentiate between restrictive and restrictive ventilation disorders.