ROCK1 and miotic rate: 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).