No history of atrial fibrillation or myocardial infarctionXx_NEWLINE_xXPatients with a history of the following within =< 12 months of study entry are not eligible:\r\n* Arterial thromboembolic events\r\n* Unstable angina\r\n* Myocardial InfarctionXx_NEWLINE_xXNo angina or myocardial infarction within 182 days of registration; in view of potential cardiac risk with lenalidomide, patients with stable angina will be excludedXx_NEWLINE_xXNo clinically significant cardiac arrhythmias, stroke or myocardial infarction within 6 months prior to enrollmentXx_NEWLINE_xXMyocardial infarction within the past 6 monthsXx_NEWLINE_xXPatients must not have a myocardial infarction within 6 months prior to registrationXx_NEWLINE_xXHistory of myocardial infarction or unstable angina within 12 months prior to day 1Xx_NEWLINE_xXPatients with myocardial infarction or unstable angina < 6 months prior to starting study drugXx_NEWLINE_xXHistory of myocardial infarction within 6 months.Xx_NEWLINE_xXUnstable angina or myocardial infarction.Xx_NEWLINE_xXHistory of myocardial infarction, unstable angina, cardiac or other vascular stenting, angioplasty, or cardiac or vascular surgery within 6 months prior to day 1 of study treatmentXx_NEWLINE_xXSevere arterial thromboembolic events (myocardial infarction, unstable angina pectoris, stroke) less than 6 months before inclusionXx_NEWLINE_xXUnstable angina pectoris 6 months prior to entryXx_NEWLINE_xXHistory of prior myocardial infarction or arrhythmiaXx_NEWLINE_xXHistory or clinical signs of myocardial infarction within 1 year of study entryXx_NEWLINE_xXThe patient has had a myocardial infarction in the previous 12 weeks. (Prior to study entry, electrocardiogram [ECG] abnormalities at screening must be documented by the investigator as not medically relevant.)Xx_NEWLINE_xXSignificant ischemic coronary disease, heart failure, myocardial infarction, or unstable angina within the last six months.Xx_NEWLINE_xXThe participant has clinically relevant coronary artery disease or history of myocardial infarction in the last 12 months or high risk of uncontrolled arrhythmia or uncontrolled cardiac insufficiency.Xx_NEWLINE_xXThe participant has clinically relevant coronary artery disease or history of myocardial infarction in the last 12 months or high risk of uncontrolled arrhythmia or uncontrolled cardiac insufficiency.Xx_NEWLINE_xXHistory of thrombotic or hemorrhagic stroke or myocardial infarction within 6 monthsXx_NEWLINE_xXAcute myocardial infarction within 6 months before starting study drug.Xx_NEWLINE_xXMyocardial infarction within the last 6 monthsXx_NEWLINE_xXSevere/unstable angina, coronary artery/peripheral bypass graft, or myocardial infarction.Xx_NEWLINE_xXMyocardial infarction within the last 6 monthsXx_NEWLINE_xXPatients with other major uncontrolled medical conditions, e.g., recent myocardial infarction, stroke, diabetes, active hepatitisXx_NEWLINE_xX