Originally Posted by CloakNNNdagger
Sorry, but without seeing the MRI and/or more clinical information, that's all I can say. The anticoagulant can be used to dissolve established blocking clots and, in the case of AF, can help prevent more clots originating in the heart from being formed.
Considering the pain he was in, I can't help but think that a chunk of clot was dislodged. My mind goes to worst case scenarios.