How To Prevent Thrombolysis?

Hi,My father is a diabetic patient. He recently has undergone angiography for his left calf. but after the diagnosis he is facing lot of pain in his left hand and can see the swelling through which treatment was done..... we have approached the local Dr... accordng to him he says there are chances of thrombolysis.... Pls let me how strong are the chances for thrombolysis and how sever this could be. What all measures should be taken to prevent it.....Pls let me know