- History of significant cardiac disease unless the disease is well-controlled. Significant cardiac diseases includes second/third degree heart block; significant ischemic heart disease; QTc interval > 450 msec at baseline; poorly controlled hypertension; congestive heart failure of New York Heart Association (NYHA)Class II or worse (slight limitation of physical activity; comfortable at rest, but ordinary physical activity results in fatigue, palpitation, or dyspnea)