Classification Of Obstructive Lung Disease

Question 1

Stage 1 mild obstructive lung disease

Answer 1

Fev1/fvc ratio: < 70%

Fev1: > 80% predicted

Symptoms: with or without chronic

Question 2

Stage 2 moderate obstructive lung disease

Answer 2

Fev1/fvc ratio: < 70%

Fev1: 50% < FEV1 < 80% predicted

Symptoms: with or without chronic

Question 3

Stage 3 severe obstructive lung disease

Answer 3

Fev1/fvc ratio: < 70%

Fev1: 30% < FEV1 < 50%

Symptoms: with or without chronic

Question 4

Stage 4 very severe obstructive lung disease

Answer 4

Fev1/fvc ratio: < 70%

Fev1: < 30% predicted OR < 50% with chronic respiratory failure symptoms

Symptoms:

pa02 < 60
PaCO2 > 50
Cor pulmonale