7. Any of the following concurrent severe and/or uncontrolled medical conditions which could compromise participation in the study: i. ST depression or elevation of < 1.5 mm in 2 or more leads ii. Congenital long QT syndrome iii. History or presence of ventricular arrhythmias or atrial fibrillation iv. Clinically significant resting bradycardia (< 50 beats per minutes) v. QTc > 480 msec on screening ECG vi. Complete left bundle branch block vii. Right bundle branch block + left anterior hemiblock (bifascicular block) viii. Unstable angina pectoris < 6 months prior to starting study drug ix. Acute myocardial infarction < 6 months prior to starting study drug x. Other clinically significant heart disease such as congestive heart failure requiring treatment (NYHA Class III or IV) or uncontrolled hypertension (please refer to WHO-ISH guidelines)