This document discusses the differences between restrictive and obstructive lung diseases. Restrictive lung diseases are characterized by a reduction in total lung capacity below 80% of predicted value, while obstructive lung diseases are characterized by a reduction in airflow, seen through a decreased forced expiratory volume in 1 second and ratio of forced expiratory volume to forced vital capacity. Key lung volumes and capacities such as tidal volume, inspiratory reserve volume, and residual volume are also defined.

1. RESTRICTIVE VS. OBSTRUCTIVE
LUNG DISEASES
Fatima AlAwadh

2. INTRODUCTION
LUNG VOLUMES AND CAPACITIES
2.5 L
0.5 L
1.5 L
1.5 L
Inspiratory Reserve Volume
Tidal Volume
Residual Volume
Expiratory Reserve Volume
Inspiratory Capacity
Functional Residual Capacity
Vital Capacity
Total Lung Capacity

3. 2.5 L
0.5 L
1.5 L
1.5 L
OBSTRUCTIVE
Normal Obstructive
Forced Vital Capacity N or
Forced Expiratory Volume in 1sec
Total Lung Capacity N or
Residual Volume
FEV1 /
FVC

4. RESTRICTIVE
Normal Restrictive
Forced Expiratory Volume in 1sec N or
FEV1 / FVC N
or
Residual Volume
Forced Vital Capacity
Total Lung Capacity

5. OBSTRUCTIVE VS. RESTRICTIVE
Obstructive disorders: Obstructive disorders are
characterized by a reduction in airflow, particularly
the FEV1 and the FEV1/FVC.
Restrictive disorders: Restrictive disorders are
characterized by a reduction in lung volume,
specifically a TLC < 80% of the predicted value.

6. “Thank You”