Resp Flashcards
PEFR in obstructive disease
reduced
PEFR in restrictive disease
normal
restrictive or obstructive: asthma
obstructive
restrictive or obstructive: pulmonary fibrosis
restrictive
restrictive or obstructive: asbestosis, sarcoidosis
restrictive
restrictive or obstructive: COPD
obstructive
restrictive or obstructive: bronchiectasis
obstructive
what is measured in peak flow
peak expiratory flow rate, with variation depending on age height and sex (FVC)
what is measured in spirometry
forced vital capacity
forced expiratory volume in 1 second (FEV1)
Forced expiratory ratio (FER) - FEV1/FVC
FEV1/FVC in restrictive disease
normal
FEV1/FVC in obstructive disease
reduced
how can you distinguish between COPD and asthma in spirometry
FVC is normal in asthma but decreased in COPD
or do bronchial challenge/reversibility
results of bronchial challenge in COPD and asthma
asthma > 15% increase
COPD < 15% increase
TCLO in asthma
normal/raised
TCLO in emphysema
reduced
TCLO in restrictive disease
reduced
TCLO in Wegeners/good pastures
raised
TCLO in polycythaemia
raised
FVC: significantly reduced
FEV1: decreased
FER: > 75% i.e. normal
TCLO: reduced
restrictive pattern
restrictive spirometry pattern:
FVC, FEV1, FER, TCLO
FVC: significantly reduced
FEV1: decreased
FER: > 75% i.e. normal
TCLO - reduced
FVC - decreased
FEV1 decreased
FER decreased
TCLO decreased
COPD
spirometry of COPD
FVC - decreased
FEV1 decreased
FER decreased
TCLO decreased
what disease FVC - decreased FEV1 decreased FER decreased TCLO decreased
COPD
spirometry of asthma
FVC - normal
FEV1 significantly decreased
FER decreased
TCLO normal/raised