Of note, the expression of ROCK1 in the myolytic left atrial myocytes of the MR AF patients was significantly higher than the expression of ROCK1 in the myolytic left atrial myocytes of the normal control subjects (2173527.6 ± 159745.3 vs. 978383.3 ± 116680.7, p = 0.010). This evidence concerns the gene ROCK1 and atrial fibrillation.