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Effect of dynamic intrathoracic airway obstruction

Effect of dynamic intrathoracic airway obstruction
Left panel, during forced expiration, the intrathoracic intratracheal pressure (Ptr) is less than the pleural pressure (Ppl), worsening the obstruction. Right panel, during forced inspiration, Ptr exceeds Ppl, lessening the degree of obstruction.
Redrawn from: Kryger M, Bode F, Antic R, et al. Am J Med 1976; 61:85.
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