- Occurrence of a COPD exacerbation, which is not resolved by 4 weeks or more prior to the SV/informed consent. (Note: An exacerbation of COPD is defined as any worsening of the patient's baseline COPD symptoms requiring any treatment other than rescue albuterol or the patient's regular maintenance therapy. This includes requiring the use of systemic corticosteroids, antibiotics, and/or emergency room visit or hospitalization.)