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Extrathoracic Obstruction: During inspiration , the Extrathoracic airways collapse , making the obstruction worse. The flow is "normal " during expiration.
Intrathoracic Obstruction: During expiration , the Intrathoracic airways collapse , making the obstruction worse. The flow is "normal " during inspiration.
Extrathoracic Obstruction has "normal" Expiratory flow.
Intrathoracic Obstruction has "normal" Inspiratory flow.