A method for diagnosing arrhythmia such as atrial fibrillation is provided. A single nucleotide polymorphism present in the region 24 of the long arm of the chromosome 1, NEURL gene, or CUX2 gene is analyzed, and the risk of developing arrhythmia and/or the presence or absence of the onset of arrhythmia is diagnosed on the basis of the analysis result.
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