Spirometric Curve

A spirometric curve (also known as a spirogram or pneumogram) is a graphical representation of the volume of exhaled air at different moments of exhalation. In this case, the air flow that is blocked by the breathing loop of the spirometer is measured. In spirometry, there are several types of spirometric curves that are used to assess lung function. The purpose of the measurement is to assess the degree of obstructive syndrome in the patient, as well as the function of external respiration to form a prognosis based on functional tests.

Spirometric curves are used to determine parameters such as vital capacity, air reserve volume (the volume of air exhaled in the lungs between deep breaths and the smallest spirometric volume), rapid exhaled curvature, etc. These data also help to elucidate the factors that cause airway spasm, which can lead to a decrease in the volume of exhalation from the lungs and cause disability in patients.

There are several types of spirometry curves that help assess lung function. Among them:

The flow-volume curve shows the volume of the lungs during exhalation for a certain amount of smoke, the inhalation of which should be the same for all patients. Most often used at the peak of the FVC (maximum lung volume during inspiration and expiration) curve during the patient's life. This parameter correlates with lung health and helps determine the severity of the disease. Lung volume indicates how well the body copes with spasms at the entrance of the lungs and indicates the risk of bronchospastic conditions.