ILD
Clinical Significance---capacity
• 肺总量(TLC):VC+RV
– Normal: male5766ml;female4353ml
– Dec-: restrictive ventilation disorder
– Inc-: obstructive pulmonary disorder
• Air rate index气速指数 MVV active/predictive%
•= VC active/predictive%
• Normal =1 • <1阻塞性 • >1限制性
(2) Degrees of Lung Disfunction
VC or MVV act/pre% FEV1%/FVC%
Uncertain
N or higher
lower
Uncertain
(4) Degrees of Obstructive Emphysema
RV/TLC (%)
Normal Mild emphysema Mediate emphysema Severe emphysema
<=35% 36-45 46-55 >=56
– Inc-:Lung hyperinflation, e.g. emphysema – Dec-: Lung volume reduction, e.g. ARDS, ILD
• 功能残气量(FRC): ERV + RV
– Normal: 3112ml, female 2348ml
– Inc-:Lung hyperinflation, e.g. emphysema
– Normal: >95% – Abnormal: <86% – Severe abnormal <70% – Risk evaluation for thoracic surgery >60%