- Current evidence or recent history of any clinically significant and unstable disease (other than COPD) or abnormality in the opinion of the Investigator that would put the subject at risk or which would compromise the quality of the study data; including but not limited to cardiovascular disease, myocardial infarction, cardiac failure, uncontrolled hypertension, life-threatening arrhythmias, uncontrolled diabetes, neurologic or neuromuscular disease, liver disease, gastrointestinal disease or electrolyte abnormalities.