1. Current evidence or recent history of any clinically significant disease (other than COPD) or abnormality in the opinion of the Investigator that would put the patients at risk or which would compromise the quality of the study data; including but not limited to cardiovascular disease, myocardial infraction, hypertension, arrhythmia, diabetes, neurological or neuromuscular disease, liver disease, gastrointestinal disease or electrolyte abnormalities.