PFTs

Question 1

Obstructive pattern of spirometry

Answer 1

PEFR and FEV1 reduced
FVC in asthma normal
FVC in COPD reduced

Question 2

response of FEV1% to b2 agonist

Answer 2

> 15% = asthma

Question 3

Restrictive spirometry pattern

Answer 3

PEFR norma
FEV1 and FVC reduced
FEV1% >75% of normal

Question 4

To differentiate a cardiac or lung cause of dyspnoea use _______

Answer 4

CPET full cardiopulmonary exercise test

Question 5

volume dependant airway closure is seen in

Answer 5

asthma and chronic bronchitis

Question 6

pressure dependant airway closure is seen in

Answer 6

emphysema

Question 7

Effort dependant PFTs =

Answer 7

spirometry - Forced flow rates

Bronchial challenge testing - methacholine, allergens/chemicals, exercise tests

Question 8

effort independant PFTs =

Answer 8

R(resting)VC
He dilution/N2 washout - functional residual capacity
Whole body plethysmography or IOS (impulse oscillometry) - measure airway resistance
Exhaled breath NO - uncontrolled eosin airway inflam in asthma

Question 9

TLC ____ in restrictive lung diseases

Answer 9

decreases

Question 10

TLC ____ in emphysema

Answer 10

increases due to hyperinflation

residual volume increases so FRC increases but IC decreases

Question 11

TLCO/DLCO =

Answer 11

total lung transfer for CO

Question 12

TLCO is decreased in

Answer 12

ILD, pulmonary oedema, PE, anaemia and COPD

NORMAL IN ASTHMA