The association between inherited and acquired prothrombotic factors and sudden HL suggests that the microvascular impairment causing SSNHL may be caused by a multifactorial mechanism. All patients with ISSNHL should undergo a comprehensive hematologic investigation of inherited and acquired prothrombotic factors, including MTHFR polymorphisms, the prothrombin transition, and the platelet and V Leiden mutations, to identify a subset of patients at high risk of recurrent HL.
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