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Stroke in hypertrophic cardiomyopathy. Never mind the rhythm

      Hypertrophic cardiomyopathy (HCM) is associated with an increased risk of atrial fibrillation (AF) and stroke, representing main causes of clinical deterioration, morbidity and mortality [
      • Rowin E.J.
      • Hausvater A.
      • Link M.S.
      • et al.
      Clinical profile and consequences of atrial fibrillation in hypertrophic cardiomyopathy.
      ]. It has been demonstrated that the incidence of ischemic stroke in HCM patients with AF and no conventional risk factors is higher than in AF patients without HCM but with CHA2DS2-VASc scores of 2 [
      • Jung H.
      • Yang P.S.
      • Sung J.H.
      • et al.
      Hypertrophic cardiomyopathy in patients with atrial fibrillation: prevalence and associated stroke risks in a nationwide cohort study.
      ]. Indeed, both HCM and AF guidelines don't recommend using the CHA2DS2-VASc score in HCM patients (due to a likely systematic underestimation of risk), while recommending oral anticoagulation in all HCM patients with AF unless contraindicated and irrespective of risk scores [
      • Elliott P.M.
      • Anastasakis A.
      • Borger M.A.
      • et al.
      2014 ESC guidelines on diagnosis and management of hypertrophic cardiomyopathy: the task force for the diagnosis and Management of Hypertrophic Cardiomyopathy of the European Society of Cardiology (ESC).
      ,
      • Hindricks G.
      • Potpara T.
      • Dagres N.
      • et al.
      2020 ESC guidelines for the diagnosis and management of atrial fibrillation developed in collaboration with the European Association for Cardio-Thoracic Surgery (EACTS): the task force for the diagnosis and management of atrial fibrillation of the European Society of Cardiology (ESC) developed with the special contribution of the European heart rhythm association (EHRA) of the ESC.
      ].
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