CNBP and cardiac arrhythmia: Cardiac dysfunction has an origin in abnormal and unstable nucleotiderepeats in the DMPK and CNBP genes which have downstream effects leading to anincreased propensity for arrhythmias and left ventricular systolic dysfunction.Current screening paradigms involve the use of routine screeningelectrocardiograms, ambulatory electrocardiographic monitors, and cardiac imagingto stratify risk and suggest further invasive evaluation.