What is a thrombus? An embolus? How can they be treated clinically? That is, what needs to be injected? What can we give a patient to prevent clots while in the hospital? What test will be used to monitor clotting times while on this drug in the hospital? What can we give them when they are discharged to prevent clots? What test will be used to monitor their blood clotting times while on this medication and why should they limit their green-leafy vegetables?