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A practical and case-based approach to thrombocytopenia in cardiology practice.

In cardiology practice, anticoagulation and antiplatelet therapies are essential for most patients. As of yet, there is no high quality evidence regarding these treatments in thrombocytopenic patients, which continues to be an issue. Thrombocytopenia is defined as a platelet count of <150x109/L and is classified as severe when the platelet count is <50x109/L. Pseudothrombocytopenia, drug-induced thrombocytopenia, immune thrombocytopenia, heparin-induced thrombocytopenia, and thrombotic thrombocytopenic purpura are some of the main causes of thrombocytopenia. The current treatment suggestions are conservative, as a result of the lack of evidence, built on defensive treatment strategies and the fear of bleeding complications. Many patients with acute myocardial infarction with thrombocytopenia have undergone percutaneous coronary intervention successfully with adjunctive antiplatelet and anticoagulant use, as has been described in case reports. A risk-benefit ratio should be evaluated for antiplatelet therapy. In the relevant guidelines, while full dose low-molecular-weight heparin (LMWH) is recommended for patients with a thrombocyte count of >50x109/L, a half-dose of LMWH is recommended in patients with thrombocytopenia between 25 and 50x109/L. According to the current guidelines, avoiding antiplatelet and anticoagulant treatment should be restricted to patients with very severe thrombocytopenia (i.e., a platelet count <25x109/L), but new data and recommendations are needed.