Impaired cardiac function or clinically significant heart disease, including any one of the following: congestive heart failure, angina pectoris within 3 months, acute myocardial infarction within 3 months, QTcF > 450 msec for males and > 470 msec for females on the screening ECG, history of clinically significant ECG abnormalities, family history of prolonged QT-interval syndrome, or other clinically significant heart disease (e.g. congestive heart failure, uncontrolled hypertension, history of labile hypertension, or history of poor compliance with an antihypertensive regimen).