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Did you have DVT (blood clot / deep vein thrombosis) any time previously? Or have a family history?
What were the investigations done?
It seems that you are offline; so I am writing you an initial answer. We can discuss this further.
One of the common causes are hereditary factors as following for pulmonary embolism:
There are many other causes too like increased coagulability of blood, veins and arteries have internal irregular surfaces predisposing for the clot formation etc. Many of these may not be detected despite the medical advancements and modern medical imaging. Usually the causes for pulmonary embolism are multifactorial and are not readily apparent in many cases. Your doctor may have investigated all the above causes. Occasionally an initial investigations panel may not reveal the cause but if the same panel is repeated after sometime;; may reveal some abnormality.
Antithrombin III deficiency
Protein C deficiency
Protein S deficiency
Resistance to activated protein C
Factor V Leiden (most common genetic risk factor for thrombophilia)
Plasminogen activator abnormality.
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