How to check lung function during physical examination

Pulmonary function is generally used to test our respiratory system. Some people need to do pulmonary function tests when they cough frequently. It is more laborious to do pulmonary function tests because the patient's nose needs to be clamped and can only breathe through the mouth. In addition, it is necessary to inhale and exhale in large mouthfuls. If it is not done well, it may lead to failure. So how should pulmonary function be tested?

Pulmonary function test is a test technique that uses special medical equipment to detect the airflow speed and airflow volume generated by the respiratory tract when the human body breathes, so as to understand whether the respiratory function is normal. What are the precautions for lung function tests? Because the nose is clamped, you should learn to breathe through your mouth; hold your mouth tightly to ensure that there is no air leakage during the test; follow the doctor's instructions and exhale and inhale immediately; inhale as much as you can, and then exhale with maximum force as instructed by the doctor, and do not retain your own strength.

Which diseases require lung function tests?

Pulmonary function tests should be performed for any disease that may affect lung ventilation function. It is even more valuable in the diagnosis and differential diagnosis of common respiratory diseases such as asthma, chronic obstructive pulmonary disease (emphysema), airway foreign body aspiration, bronchitis, pneumonia, pleurisy, etc.

What are the manifestations of respiratory diseases in lung function tests?

Obstructive lesions

It refers to changes in airflow obstruction caused by narrowing of the respiratory tract due to various factors, among which asthma is the most obvious.

Restrictive lesions

It refers to the change that lung ventilation is reduced due to restricted respiratory movement of the lungs, such as emphysema, pleurisy and hydropneumothorax, all of which have varying degrees of reduced lung ventilation.

Mixed lesions

It refers to the combination of obstructive and restrictive lesions, such as chronic obstructive pulmonary disease, late-stage asthma, pneumoconiosis, and pediatric bronchopneumonia.