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Hypercoagulable states (HS) are well recognized as a cause of arterial and venous thromboembolism. These coditions are usually associated with abnormalities in natural anticoagulants, the fibrolytic system, or platelet aggregation. Primary arterial thrombosis is unusual in the young population. Hypercoagulable states are usually acquired, but they may be congenital. The congenital states occur in response to deficiency of protein C, protein S, AT-Ⅲ. And the acquired states occur in response to disease, in response to tissue injury, or in response to therapy. But in this country, we have no any data of prevalence ratio of HS, which developed symptome of arterial occlusion, cases of bypass and theapeutic modality. We experienced two cases of acquired HS that is antiphospholipid syndrome and polycythemia. Based on our experience with this patients and a review of the literature on the previously reported. And we suggest that there will be made for the purpose of studying non-atherosclerotic lower extremity occlusion registry which developed in our country through the small study group.
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