Pulmonary function tests Spirometry & Diffusion - Dr. Sheetu Singh

1
2. Spirometry

Predicted Actual predicted
FEV1 3.18 2.38 75
FVC 3.97 2.38 60
FEV1/FVC 100
?Step 2
Step 1?
2
Spirometry Interpretation
FEV1/FVC
Step 1
gt70
lt70
Step 2
FVC
FVC
lt80 Obstruction Restrictive
gt80 Obstruction
lt80 Restrictive
gt80 Normal
3
2. Spirometry

• What type of defect is seen on spirometry for
  ILD?
• Restrictive
• Obstructive
• Normal

4
Spirometry

• Restrictive 731 (79)
• Obstructive 92 (10)
• Normal 106 (11)
• Total 929

Myth All ILD have restrictive defects 1 in 5
do not have restrictive spirometry
5
Pulmonary function tests Spirometry Diffusion
study

• Most of the ILD have a restrictive defect.
• Smoking history should be considered
• Mixed pattern
• - Sarcoidosis
• - Hypersensitivity Pneumonitis (HP)
• - Smokers