Mitochondrial myopathy in rheumatology: Comment on the article by Albert et al
Article first published online: 26 JUN 2012
Copyright © 2012 by the American College of Rheumatology
Arthritis Care & Research
Volume 64, Issue 7, pages 1099–1100, July 2012
How to Cite
Carey, J. J., Coughlan, R. J. and O'Sullivan, M. (2012), Mitochondrial myopathy in rheumatology: Comment on the article by Albert et al. Arthritis Care Res, 64: 1099–1100. doi: 10.1002/acr.21605
- Issue published online: 26 JUN 2012
- Article first published online: 26 JUN 2012
- Accepted manuscript online: 11 JAN 2012 02:18PM EST
To the Editor:
In a recent article in Arthritis Care & Research, Albert et al provided a concise and interesting review for rheumatologists on mitochondrial myopathies (1). The authors described 4 different categories of patient presentation, highlighted by 3 short cases. The article outlined clinical features compatible with a mitochondrial myopathy, a differential diagnosis, and tests to consider in such patients with an emphasis on muscle histology. The authors, however, did not include fibromyalgia syndrome in the differential diagnosis, which is particularly relevant to case 3 (1).
Fibromyalgia syndrome is a common disorder characterized by widespread pain in the muscles, bones, and joints, often with additional symptoms including fatigue, poor sleep, headaches and dizziness, irritable bowel syndrome, and cognitive difficulties (2–4). Elaborations on the original 1990 American College of Rheumatology criteria for the classification of fibromyalgia (2) have been published recently in Arthritis Care & Research (3). Many of the clinical features of fibromyalgia syndrome are not unlike those that the patient in case 3 presented with (1–5). In practice, the clinical suspicion for a diagnosis of fibromyalgia syndrome is often supported by the negative results of testing such as routine laboratory studies, imaging, and, when ordered, electromyogram studies (4). Clinicians familiar with this syndrome can diagnose the condition easily and confidently and usually do not order expensive or exhaustive diagnostic testing. Treatment is effective for the majority of patients (4–5).
Fibromyalgia is thought to affect somewhere between 0.5% and 4% of the general population (4–5). Fibromyalgia syndrome is a common diagnosis among patients referred to a rheumatology clinic (4, 5), whether as a primary syndrome or a diagnostic dilemma, and more frequently encountered than rare disorders like the idiopathic inflammatory myopathies, systemic lupus erythematosus, vasculitis, and, it would appear, mitochondrial myopathies. Therefore, we suggest that fibromyalgia syndrome should be included in the differential diagnosis of mitochondrial myopathies.
On a practical level, advice for rheumatologists on how to differentiate these 2 conditions and when to consider additional testing for mitochondrial myopathies in patients labeled as “fibromyalgia syndrome” would be very helpful.
- 1When should a rheumatologist suspect a mitochondrial myopathy? Arthritis Care Res (Hoboken) 2011; 63: 1497–502., , , , , , et al.
- 2The American College of Rheumatology 1990 criteria for the classification of fibromyalgia: report of the Multicenter Criteria Committee. Arthritis Rheum 1990; 33: 160–72., , , , , , et al.
- 3The American College of Rheumatology preliminary diagnostic criteria for fibromyalgia and measurement of symptom severity. Arthritis Care Res (Hoboken) 2010; 62: 600–10., , , , , , et al.
- 4Rheumatology. 4th ed. Philadelphia: Mosby Elsevier; 2008. p. 701–11..
- 5Management of fibromyalgia syndrome. JAMA 2004; 292: 2388–95., , .
John J. Carey MBBChBAO, MS*, Robert J. Coughlan MBBChBAO, MD*, Muiris O'Sullivan MBBChBAO*, * Galway University Hospitals, Galway, Ireland.