Respiratory function
仁济医院急诊科 郑翠霞
ventilation Gas exchange
Airway
（ patency)
Respiratory
muscle
Air volume
Effective
capillary bed
Airway pressure
gradient
Respiratory Function Test
?Spirolmetry
?Airway resistance & compliance
?Diffusion capacity measure CO
?Exercise respiratory function test
Spirometry Terms
? VC (vital capacity)
? TV (tidal volume)
? FEV1(1st second forced expiratory volume)
? ERV (expiratory reserve volume)
? IRV (inspiratory reserve volume)
? IC (inspiratory capacity)
Static parameters
? TLC (total lung capacity)
? RV (residual volune)
? FRC (functional residual capacity)
Forced expiratory values
Time lung function / time-volume
curve
expiration
inspiration
a,Normal
b,Decreased overall
flows
c,Decreased flow
at high volumes
d,Decreased flow
with normal
flow-volume
relationship
J,
Technical or method
Body pletgtsnigraph for the measurement
MVV(maximal minute ventilation) =FEV1* 35
VE( minute ventilation) = TV* RR(respiratory rate)
Respiratory function abnormality,
?Obstructive,FEV1<70%FVC;
MVV< 80%pred
seen in obstructive
pulmonary diseases(COPD) &
asthma
Criteria for quantitating degree of
obstruction
Limitative,
?VC< 80%pred,MVV
? pleural,chest wall,intestinal lung
disorders
CO diffusing capacity
?Dlco = Vco PAco – Pcco __________
Diffusion abnormality,
Intestinal lung disease
Pulmonary edema
Pulmonaary vascular disorders
Blood gas analysis
Exercise lung function
?Maximal volume/ minite
volunes of O2 and CO2
?Abnormality type on exertion
Lung limited
obstructed
heart