2018年7月1日 · Forced vital capacity (FVC): the total volume of air that the patient can forcibly exhale in one breath. FEV1/FVC: the ratio of FEV1 to FVC expressed as a percentage. Values of FEV1 and FVC are expressed as a percentage of the predicted normal for a person of the same sex, age and height.

GOLD 把 FEV1 /FVC ＜ 70% 作为定性标准，对以中、老年为主的 COPD 患者有较高的准确度，但仍需注意在 低龄人群的高漏诊率和高龄人群的过度诊断。 FEV1 /FVC 随年龄增大逐渐下降。 小儿FEV1 /FVC 常≥95% ，健康青年人多≥85% ; ≥70 岁男性为 ( 80. 2 ± 4. 5) %。 四 为什么使用正常预计值？ 1.临床试验发现“正常人”中有“气流阻塞”的患者。 结果： FEV1 /FVC 低于70% （正常人群低限）的年龄为女性 61 岁、男性 48 岁，远低于年龄超过 70 岁才可能低于 70% 的实际 …

During FVC manoeuvre, peak expiratory flow (PEF), which is the maximum flow generated during forceful exhalation, may also be measured. PEFR (peak expiratory flow rate) is reliable and easy to be measured by patient at home and can be valuable in asthma management.

2023年8月28日 · An obstructive defect is a disproportional decrease in maximal airflow from the lung (FEV1) relative to the maximal volume (FVC) that can be displaced from the lung. In practical terms, an FEV1/FVC ratio of less than 0.70 defines an obstructive ventilatory defect.

2020年3月15日 · Airway obstruction is suspected when there is a decreased forced expiratory volume in one second/forced vital capacity (FEV 1 /FVC) ratio, but there is no strong evidence to clearly define what...

2021年11月15日 · FEV1/FVC 无公认标准，原则上应结合病史和其他肺功能指标、检查图形进行诊断，我国肺功能检查指南推荐以 FEV1/FVC > 92% 预计值为正常，避免与慢阻肺的诊断标准 (FEV1 / FVC < 0.7) 混淆。 不管是正常值下限还是预计值，都是建立在国人数据基础上，经性别、年龄、身高、体重调整得到的预计水平，因此肺功能报告才必须有受检者的一般状况信息。 肺功能通气功能障碍一般分为三大类，阻塞性通气功能障碍、限制性通气功能障碍和混合性通气功能 …

Measurement of the Tiffeneau ratio (FEV1/FVC) and the morphology of the flow-volume curves can be used to differentiate between : Obstructive pathologies : Decreased FEV1 with Tiffeneau < 0.7 (according to GOLD criteria - does not recognize very distal obstructive disease).

2015年6月24日 · 肺功能检查可测定用力肺活量（fvc，尽力最大吸气后尽力尽快所能呼出的最大气量）和第一秒用力呼气量（fev 1 ，尽力最大吸气后第一秒内尽力尽快呼出的气量）。

– Forced Vital Capacity (FVC): This measures the maximum amount of air you can inhale forcefully after having had a big breath out. – Forced Expiratory Volume in 1 second (FEV1): This measures the amount of air you can exhale in the first second of a forced breath out.

FEV1/FVC ratio helps identify obstructive disease; FEV1 helps determine the severity of obstruction; FVC helps assess for restrictive disease; Comparing values to predicted norms allows us to gauge severity; Result differences before and after taking medication help assess the efficacy of treatments