<prompt> Hypercoagulability and dermal vascular necrosis are early appearing adverse effects of:ClopidogrelHeparinWarfarinVitamin K  <response>: Oral anticoagulants inhibit the activation of several clotting factors II, VII, IX and X as well as anti-clotting proteins protein C and S. First to disappear is protein C that can result in hypercoagulation resulting in dermal vascular necrosis. 