Fig. 2From: COPD – do the right thingThe pathophysiology of COPD exacerbations. Reproduced with permission from: Wedzicha JA, Seemungal TAR. COPD exacerbations: defining their cause and prevention. Lancet. 2007;370(9589):786–96. Copyright © Elsevier 2007. COPD chronic obstructive pulmonary diseaseBack to article page