- Evidence or history of bleeding diathesis (greater than normal risk of bleeding) or coagulopathy (in the absence of therapeutic anticoagulation); NOTE: patients on full-dose anticoagulants are eligible provided the patient has been on a stable dose for at least 2 weeks of low molecular weight heparin or warfarin and has an INR in the range of 2-3; aspirin doses > 325 mg PO daily are not allowed