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  • Key words Oral anticoagulant therapy  (1)
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    ISSN: 1432-0584
    Keywords: Key words Oral anticoagulant therapy ; Phenprocoumon ; Factor IX ; Bleeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Two male patients with severe and recurrent bleeding episodes under phenprocoumon therapy are reported. Both patients exhibited a strong decrease of their factor IX activities below 1% of normal, whereas the activities of the vitamin K-dependent factors prothrombin, VII, and X were found to be within or above the expected therapeutic ranges of 20–40%. Upon removal of phenprocoumon and substitution with vitamin K, the factor IX activities increased to 85% and 55%, respectively. Reexposition to phenprocoumon in one patient confirmed the rapid and selective decrease of the factor IX activity. These findings provide the first report of an abnormally high sensitivity of factor IX activity to oral anticoagulant therapy.
    Type of Medium: Electronic Resource
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