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Flow-volume loop and variable obstruction at the thoracic inlet

Flow-volume loop and variable obstruction at the thoracic inlet
Flow-volume loop in variable obstruction at the thoracic inlet showing a double hump in the expiratory curve as the narrowing moves from an intrathoracic to a relative extrathoracic location toward the end of expiration.
TLC: total lung capacity; RV: residual volume; L: liters.
Graphic 54799 Version 2.0