文档介绍：Respiratory Function Test
Respiratory Function Test
Lung volumes
Ventilation function
Gas exchange
Blood flow
Respiratory motive force
Lung Volume and Subdivisions
VT
IRV
ERV
RV
IC
FRC
VC
RV
TLC
Basal Lung Volume
VT (tidal volume): 500ml
IRV (inspiratory reserve volume)
ERV (expiratory reserve volume)
RV (residual volume)
Basal Lung Capacity
IC (inspiratory capacity): VT+ IRV
FRC (functional residual capacity):
ERV + RV
VC (vital capacity) : IC + ERV
normal men: 4217ml
women: 3105ml
TLC (total lung capacity): VC + RV
Some Explanatory Points
Lung volume is to describe the changes of the lung volume during one breathing at static conditions, also called static lung volume.
VT, VC, TLC are used at clinical. VT and VC are determined by Spirometric trace , but FRC and RV by indirect method: Helium or Nitrogen analyses method.
Clinical Significance
VC depends on sex, age and height.
VC% < 80% is abnormal.
VC : restrictive ventilation disorder
severe obstructive ventilation disorder
Clinical Significance
RV/TLC% (residual air rate)
normal : < 35%
emphysema: > 40 %
old person can be 50%.
FRC : emphysema
FRC : interstitial pulmonary fibrosis
Ventilation Function Test
It is called as dynamic lung volumes.
Fast spirometric trace to illustrate timed ventilation tests (air volume and air flow during breathing).
Ventilation Function Test
Lung ventilation volume
VE and MVV
Forced vital capacity (FVC)
Maximal mid-expiratory flow (MMEF. MMF)
Alveolar ventilation (VA)
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