Periop Investigations

Question 1

RFT 1

Answer 1

1. FEV1/FVC = 0.72
   - not obstructive
2. FEV1 = 91%
3. TLC/VC/FVC > 80%
   - not restrictive
4. DLCO or TLCO

NORMAL

Question 2

RFT 2

Answer 2

1. FEV1/FVC = 89% - good!
2. FEV1 = 80% - not obs
3. TLC < 80% = Restrictive disease
4. DLCO < 80% = decreased
   adj VA

Parenchymal disease

Question 3

RFT 3

Answer 3

1. FEV1/FVC = 55% (< 0.7) = obstructive
2. FEV1= 53% (0.5-0.8) = MOD
3. TLC / VC /FVC = 97%
4. Post BD change > 12 %

Asthma

Question 4

Answer 4

1. FEV1/FVC = 0.43 = obs
2. FEV1 = 60% = mod
3. no change post BD
4. DLCO < 80% = emphysema

TLCO/L = corrected for volume = 44% still low

L = VA

COPD

Question 5

Answer 5

1. FEV1/FVC = 0.7
2. FEV1 = 87% = not restr
3. FVC = 94% = not restr
4. no post BD change
5. DLCO = < 80%
6. Adj for VA and Hb = still low

Parenchymal or vascular dx

Question 6

Answer 6

Not obs
TLC < 80% = restrictive dx

TLCO corrected for vol and Hb still low

Parenchymal dx
Not severe dx
ILD / emphysema

Question 7

Answer 7

FEV1/FVC = 0.45

FEV1 = 0.44 = severe

Post BD change > 12% but obstruction remains

Reversible obstructive lung dx

DLCO < 80%

Question 8

Answer 8

FEV1/FVC = 0.85
FEV1 0.63 = restrictive
No post BD change
FVC < 0.57 (mild / mod)

DLCO < 80% , normal after correcting of VA and Hb

Mod restrictive defect