Thrombocytosis Associated with Low-Molecular-Weight Heparin

  1. Eliot Williams, MD, PhD
  1. University of Wisconsin, Madison, WI 53792

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    TO THE EDITOR:

    Rizzieri and coworkers [1] report a case of thrombocytosis that they attribute to treatment with enoxaparin. The patient had metastatic carcinoma and was asplenic; enoxaparin was given for pulmonary embolism. The platelet count was normal (285 cells/mm3) before enoxaparin treatment, increased to 1114 cells/mm3 within 4 weeks of treatment, and became normal after chemotherapy for carcinoma and discontinuation of enoxaparin therapy. I propose an alternate explanation for these findings. I suspect that the patient had the Trousseau syndrome with disseminated intravascular coagulation and rapid platelet consumption. A platelet count of more than 1 million cells/mm3 could result from the combination of metastatic carcinoma and asplenia [2]; the increase in platelet count after enoxaparin treatment may therefore have represented a return to “baseline” as a result of suppression of disseminated intravascular coagulation by enoxaparin rather than an increase in platelet production induced by that drug.

    Eliot Williams, MD, PhD

    University of Wisconsin; Madison, WI 53792

    The Editors welcome submissions for possible publication in the Letters section. Authors of letters should:

    •Include no more than 300 words of text, three authors, and five references

    •Type with double-spacing

    •Send three copies of the letter, an authors' form signed by all authors, and a cover letter describing any conflicts of interest related to the contents of the letter.

    Letters commenting on an Annals article will be considered if they are received within 6 weeks of the time the article was published. Only some of the letters received can be published. Published letters are edited and may be shortened; tables and figures are included only selectively. Authors will be notified that the letter has been received. If the letter is selected for publication, the author will be notified about 3 weeks before the publication date. Unpublished letters cannot be returned.

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