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Myocardial fibrosis causes the fragmentation of QRS complexes (fQRS) on ECGs. We hypothesized that the frequency of fQRS could be more common in patients with rheumatoid arthritis (RA) than in control subjects. A total of 56 patients with RA were compared with 35 age- and gender-matched fibromyalgia subjects for fQRS. The fQRS was defined as the presence of an additional R wave, or notching of the...