12. Myocardial infarction within the past 6 months prior to Study Day 1, or has New York Heart Association (NYHA) Class III or IV heart failure or arrythmia, unstable angina, uncontrolled congestive heart failure or arrythmias, or electrocardiographic evidence of acute ischemia or active conduction system abnormalities.Prior to study entry, any ECG abnormality at screening must be documented by investigator as not medically relevant.