Vitality (VC) is one of the key parameters used to evaluate lung function and ability, and provides basic insights on the lungs that can effectively hold and excrete air. This measurement is essential for diagnosis and monitoring of various lung conditions.
Different from the mandatory maximum capacity that expires as soon as possible, the expiration of the expiration in the process of important capacity will not be rushed. Instead, it is completed as much as possible to ensure that all air that can voluntarily exhale voluntarily from the lungs is expelled.
Vitality refers to the total amount of air that can exhale after the deepest inhalation. It can calculate the residual volume as the total lung capacity, which is the air that remains in the lungs after strong exhalation. The remaining volume cannot be expelled voluntarily, but it plays a vital role in keeping the alveoli (small airbags in the lungs) open and preventing lung collapse.
Component of important abilities
To understand important abilities more comprehensively, it is important to check the specific components that help this measurement. Vitality is the sum of the lung volume of several lungs in the air exchange process during breathing. The key component is:
- Tide Volume (TV)
The tidal volume refers to the amount of air inhaling or exhaling in a normal, relaxed breathing. It is the minimum volume involved in the breathing cycle, usually about 500 ml among the average adults of the quiet adult. - Inspiration reserves (IRV)
The inhalation reserves are the maximum amount of air that can be inhaled after normal inhalation. This represents extra air that can be absorbed by the lungs when performing deep breathing. - Exile reserves (ERV)
The exhalation reserves are the maximum air that can exhale after normal exhalation. Like IRV, ERV represents the extra volume that the lungs can be removed during the forced breathing. - Remaining volume (RV)
The residual volume is the air that remains in the lungs after the most breath. This volume is essential because it can prevent alveolar crash and ensure that even if a person does not breathe positively, gas exchange can continue.
sum Tide Volume (TV),,,,, Inspiration reserves (IRV)and Exile reserves (ERV) Provide us with a total important ability:
Vitality (VC) = TV + IRV + ERV
It is important to note that because the unable to exhale voluntarily, the residual volume (RV) does not include in important ability measurement.
Lung ability
The lung ability is a term used to describe the maximum air volume that can be held in the lungs. These capabilities include:
- Total lung capacity (TLC)The
The total capacity of the lung refers to the maximum air volume that can be held after the forced inspiration. Among healthy adults, TLC is about 6000 ml. Can be calculated as:TLC = TV + ERV + IRV + RV - Vitality (VC)The
Life capacity is the total air that can be exhaled after maximum inhalation, or the maximum air that can breathe after the forced expiration. This is an important measure of a person’s breathing health. A decrease in vitality may indicate Restricted lung diseaseThe lungs cannot be fully expanded. On the contrary, in Obstructive lung disease (For example, asthma or COPD), lung dilation is not a problem, but the airflow is blocked in the airway. The calculation of vitality is:Vc = TV + ERV + IRV - Inspiration (IC)The
This is the total amount of air that can be inspired after normal expiration, usually about 3600 ml. It is calculated as:IC = TV+ IRV - Functional Residual Capability (FRC)The
Functional residual ability refers to the remaining air in the lungs after normal exhalation, usually about 2400 ml. Can be calculated as:FRC = ERV + RV
Normal range and change
The important ability of healthy adults is usually between 3 and 6 liters, although this depends on several factors. The key decisive factor of vitality includes:
- age: Due to the loss of lung elasticity, with the age of people, vitality often decreases.
- gender: Due to the difference in body shape and lung volume, men usually have higher important capabilities than women.
- high: Individuals with shorter people often have greater lung ability, so they have higher life ability.
The important ability of the two has been reduced Obstruction and Restriction Lung disease. In blocking disease asthma and Chronic obstructive pulmonary disease (COPD)The airway becomes narrow, making it more difficult to expel air. In restrictive diseases Pulmonary fibrosisThe lung tissue becomes stiff, restricting lung swelling and reducing the total air that can inhale or exhale.
In addition, vitality is related to the disability level of chronic respiratory diseases. With the deterioration of lung function, the vitality is often observed. Over time, monitoring VC can help evaluate the effectiveness of the progress of the disease and treatment.
Type of important ability measurement
According to the test background, you can evaluate vitality in different ways. The following is the most common important ability measurement type used in clinical practice:
- Forced exhalation vitality (FVC)
The test measures the total air that can forcibly exhale after taking a deep breath. Usually measure the FVC with a set interval (such as 1 second (FVC1) or 3 seconds (FVC3)). Forcing in a short period of time can highlight any obstruction in the airway, which makes the test particularly useful in diagnosis of obstructive lung disease. - Chronic Vitality (SVC)
Slow vitality test involves slow, controlling inhalation and air exhalation. It can measure the total air that can easily inhale and exhale. This type of measurement is particularly useful in identifying restricted lung diseases, because the lungs cannot be fully expanded due to stiffness or scars. - Forced inspiration (FIC)
This test can measure the amount of air that can be inhaled after being fully exhaled. Like forced expiration, forced inspiration can help determine the conditions for restricting deeper inhalation ability, such as restricted lung diseases.
Lung volume measurement method
Important capabilities with lung activity measurement measurement
The most commonly used life ability is to use Lung volume meterRequirement of lung inspiration and expired air volume. The lung volume meter can accurately measure the volume of the lungs by tracking the air that is exhaled in different circumstances, including vitality.
The process of measuring the important capacity of the lung activity measurement usually involves the following steps:
- Prepare: The tested person was asked to sit comfortably or stand upright to ensure that their chests and abdomen were relaxed. If necessary, you can clamp your nose to ensure that all the exhaled air passes through your mouth.
- Inhale: Instructed individuals to deepen, maximize inhalation, and expand the lungs as much as possible.
- Exhale: After being fully inhaled, the person is required to exhale vigorously as much as possible. In the process, the lung volume meter measured the total amount of air excretion.
- Record: The total number of exhalation (vitality) of the lung volume meter, and other measurement values, such as exhalation time and air flow rate.
Using other measurement of spiral meter
During the period of lung volume measurement method, several other measurement values were also collected, which can provide more detailed insights for lung function:
- Forced exhaling volume in one second (Fev1)The
FEV1 refers to the amount of air exhaling in the first second of the forced expiration. This is one of the most important measurements in the lung activity measurement method, because the reduced FEV1 may be an early signs of obstructive lung disease COPD and asthmaEssence Healthy people usually exhale most of the air in the first second, while the people who block the airway are slower. - Forced the exhalation amount within three seconds (Fev3)The
Similar to Fev1, the amount of air derived from FEV3 in the first three seconds of forced exhalation. The measurement provides other information about air flow obstruction, which can be used to evaluate the severity of lung disease. - Peak Volume (PEF)The
Peak exhaling flow measurement can reach the highest traffic that a person can reach during the period of compulsory expiration. It reflects the speed of exhalation and is usually used to monitor patients with asthma or other chronic respiratory system diseases. The reduction of PEF may indicate the deterioration of the airway. - Remaining volume (RV)The
The residual volume is the amount of air in the lungs after a person completes the amount of air in the lungs. This volume cannot be measured directly through the lung activity measurement method, but it is critical to understanding the overall lung function, and can be measured using other technologies (such as human impurities).
The role of forced exhalation and the role of the important ability in the diagnosis
Combine Forced exhalation and Forced life It plays a core role in the diagnosis and management of respiratory diseases:
- Diagnosis COPDThe
this FEV1/FVC ratio (The ratio of the amount of compulsory exhalation and the ability of life in one second) is the key indicator of diagnosis Chronic obstructive pulmonary disease (COPD)Essence The combination of reduced Fev1 and lower Fev1/FVC ratio indicates obstructive lung disease. The feature of COPD is the limitation of airflow, and the decrease in Fev1 is a sign of this situation. - Monitor lung diseaseThe
this FEV1 Value can help doctors determine the stage of COPD or other chronic lung diseases. reduce FEV1 Over time, this disease is deteriorating. In contrast, the improvement of FEV1 after drug or treatment may indicate that the lung condition is stable or improved. - Evaluation treatment effectivenessThe
Forced life ability testing and FEV1 measurement value helps to evaluate a person’s response to drugs for bronchial extensions or other drugs for open airway for bronchidas or other diseases such as asthma or COPD. These measurements are particularly important when adjusting the effectiveness of the treatment plan or monitoring inhalers and other treatment intervention measures.
The importance of monitoring important abilities
Monitoring life ability is an important tool for assessing lung health, especially for patients with chronic respiratory diseases. The conventional lung volume test enables medical care providers to track the changes in lung function over time, helping to discover potential problems as early as possible and modify the treatment strategy. For example, in patients asthmaMeasuring changes in vitality can help evaluate whether it has aggravated, and how to control the symptoms of asthma drugs.
In addition to the clinical aspects, lung function in dangerous people is often monitored (such as smokers, people with a family medical history of respiratory diseases, and people who are in career exposed to lung diseases) can help capture the stage of lung disease early. Early intervention can prevent further lung damage and improve long -term health.
in conclusion
Vitality is an important measure for lung health and is essential for diagnosis and monitoring of respiratory diseases. It is affected by a series of factors, including age, gender, height, and overall health. Measure the important abilities by testing Forced exhalation vitality (FVC),,,,, Chronic Vitality (SVC)and Forced inspiration (FIC)Medical care providers can evaluate obstructive and restricted lung diseases. Also, the measurement image FEV1,,,,, FEV3,,,,, PEFand Remaining volume Provide comprehensive pictures of lung function. Conventional lung volume measurement and continuous monitoring are essential for managing chronic respiratory diseases and ensuring that patients maintain their best lung health.
