Why is my hospitalized patient with alcohol withdrawal syndrome so thrombocytopenic?

Although thrombocytopenia associated with chronic alcoholism may be related to complications of cirrhosis (eg, platelet sequestration in spleen due to portal hypertension, poor platelet production, and increased platelet destruction) (1), it may also occur in the absence of cirrhosis due to the direct toxic effect of alcohol on platelet production and survival (2).

 
In a prospective study of patients ingesting the equivalent of a fifth or more daily of 86 proof whiskey admitted for treatment of alcohol withdrawal—without evidence of severe liver disease, infection or sepsis— 81% had initial platelet counts below 150,000/µl, with about one-third having platelet counts below 100,000 µl (as low as 24,000/ul) (3).

 
In most patients, 2-3 days elapsed before the platelet count began to rise significantly, peaking 5-18 days after admission. Others have also reported that platelet counts rise within 5-7 days and normalize in a few weeks after alcohol withdrawal (1); bleeding complications have been uncommon in this setting.

 
Perhaps even more intriguing is the report of the association between thrombocytopenia in early alcohol withdrawal and the development of delirium tremens or seizures (sensitivity and specificity ~ 70%, positive predictive value less than 10% but with a negative predictive value of 99%) (4)! In fact, the authors suggested that, if their findings are corroborated, a normal platelet count could potentially be used to identify patients at low risk of alcohol withdrawal syndrome and therefore outpatient therapy. 

References
1. Mitchell O, Feldman D, Diakow M, et al. The pathophysiology of thrombocytopenia in chronic liver disease. Hepatic Medicine: Evidence and Research 2016;8 39-50. https://www.dovepress.com/the-pathophysiology-of-thrombocytopenia-in-chronic-liver-disease-peer-reviewed-article-HMER
2. Cowan DH. Effect of alcoholism on hemostasis. Semin Hematol 1980;17:137-47. https://www.ncbi.nlm.nih.gov/pubmed/6990498
3. Cowan DH, Hines JD. Thrombocytopenia of severe alcoholism. Ann Intern Med 1971;74:37-43. http://annals.org/aim/article-abstract/685069/thrombocytopenia-severe-alcoholism.

4. Berggren U, Falke C, Berglund KJ, et al. Thrombocytopenia in early alcohol withdrawal is associated with development of delirium tremens or seizures. Alcohol & Alcoholism 2009;44:382-86. https://www.ncbi.nlm.nih.gov/pubmed/19293148

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Why is my hospitalized patient with alcohol withdrawal syndrome so thrombocytopenic?

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