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A number of conditions can mimic the symptoms of an exacerbation and require evaluation. Airway and systemic inflammatory changes at exacerbation are modulated by infective factors (viruses and bacteria) and lead to the pathophysiologic effects seen at exacerbations with increase in airflow obstruction. Although bacteria or viruses can be isolated at exacerbation, often these organisms act in combination and lead to greater inflammatory changes and more severe exacerbation. Underlying structural changes such as radiologic changes of bronchiectasis that can be found in COPD can also modulate exacerbation severity and contribute to morbidity associated with exacerbations.<\/jats:p>","DOI":"10.1513\/pats.200707-106th","type":"journal-article","created":{"date-parts":[[2007,12,11]],"date-time":"2007-12-11T18:18:22Z","timestamp":1197397102000},"page":"602-605","source":"Crossref","is-referenced-by-count":19,"title":["Structural and Functional Co-conspirators in Chronic Obstructive Pulmonary Disease Exacerbations"],"prefix":"10.1093","volume":"4","author":[{"given":"Jadwiga A.","family":"Wedzicha","sequence":"first","affiliation":[{"name":"Academic Unit of Respiratory Medicine, Royal Free and University College Medical School University College London, London, United Kingdom and"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"John R.","family":"Hurst","sequence":"additional","affiliation":[{"name":"Academic Unit of Respiratory Medicine, Royal 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