Residual capacity/total lung capacity ratio (RV/TLC)

The amount of residual gas is the amount of gas remaining in the lungs after deep hearing. Emphysema, small airway is over closed. Residual gas volume and total lung volume increased significantly, suggesting chronic obstructive ventilatory disorders such as emphysema and pulmonary heart disease. The ratio of residual volume to total lung volume is related to age and increases with age, with the elderly reaching 0.50. Basic Information Specialist classification: Respiratory examination classification: pulmonary function test Applicable gender: whether men and women apply fasting: not fasting Tips: Two days before the examination, all the drugs for bronchiectasis should be stopped, such as Shuchuanling, Bangfu, Meipuqing, aminophylline, Shufumei Lehui, Asami, Aichuan, etc. Otherwise it will affect the inspection result. Normal value Male: 0.307; Female: 0.29. Clinical significance 1, increase emphysema, small airway in the closure and so on. Residual gas volume and total lung volume increased significantly, suggesting chronic obstructive ventilatory disorders such as emphysema and pulmonary heart disease. 2, the amount of residual gas / lung volume ratio is related to age, with age, the elderly can reach 0.50. High results may be diseases: emphysema, obstructive emphysema, pulmonary heart disease considerations Two days before the examination, all the drugs for bronchodilation should be stopped, such as Shuchuanling, Bangfu, Meipuqing, aminophylline, Shufumei Lehui, Asami, Aichuan, etc., otherwise it will affect test result. Inspection process 1. The mouth of the subject contains an interface device, which fixes the nose clip and makes a calm breath through the mouth. When the tidal curve is stable, the force is maximally inhaled at the end of the calming end of expiration, and the maximum exhalation is then applied. At the same time, the recorder was recorded in the whole process to record the lung volume map. 2. According to the definition of lung volume composition, the measured values ​​of VT, VC, IC and ERV were measured on the lung volume map. Not suitable for the crowd If you have a serious cardiopulmonary disease, you should consult your doctor before doing this check. Adverse reactions and risks Generally no complications and harm.