<prompt> LMV heparin is preferred over unfranctioned heparin becauseLMV heparin directly inhibits thrombin whereas unfranctioned heparin acts activation of antithrombinLMV heparins have been lesser risk of causing bleedingLMV heparin have lesser risk of causing bleedingLMV heparin has consistent bioavalilabilty  <response>: Refer KDT 7e p 619 Major advantage of LMV heparins over unfranctioned heparin is that it does not require monitoring bad it has consistent subcutaneous bioavalilabilty Both of these work by activating antithrombin Risk of bleeding is present with both LMV as well as unfranctioned heparin None of these us effective orally 