- History of any one of more of the following cardiovascular conditions within the past 6 months: Cardiac angioplasty or stenting; myocardial infarction; unstable angina; symptomatic peripheral vascular disease; coronary artery by-pass graft surgery; class III or IV congestive heart failure as defined by the New York Heart Association (NYHA); history of cerebrovascular accident, pulmonary embolism or untreated deep venous thrombosis (DVT) within the past 6 months.