Ischemic Stroke in a Patient With Atrial Tachycardia, Methylenetetrahydrofolate Reductase Mutation and New-Onset Atrial Fibrillation: Is Early Initiation of Anticoagulation Therapy Indicated?

Atrial fibrillation is the most common dysrhythmia, affecting about 6 million people in the United States. Atrial fibrillation has been shown to be an independent risk factor for stroke. Atrial tachycardia are common findings on Holter monitoring in the general population and may be associated with the development of atrial remodeling and atrial fibrillation inducibility. Studies have shown that atrial tachycardia is associated with the development of atrial fibrillation and subsequent stroke. The American Heart Association current guidelines recommend the use of oral anticoagulants in patients with atrial fibrillation and an elevated CHA2DS2-VASc ≥2 in men or ≥3 in women. However, anticoagulant therapy is not currently recommended in patients with atrial tachycardia despite increasing evidence of its association with the development of stroke. We report the case of a 68-year-old woman with a past medical history significant for repetitive atrial tachycardia and methylenetetrahydrofolate reductase mutation who presented to an outside emergency department following a fall, weakness and associated aphasia while in atrial fibrillation. Thrombolysis and control of the patient's rhythm resulted in an initial improvement in the patient symptoms and reversal to normal sinus rhythm. She was subsequently referred to a tertiary stroke center for further management.