In:
The Journal of Rheumatology, The Journal of Rheumatology, Vol. 45, No. 4 ( 2018-04), p. 538-546
Abstract:
To investigate muscle impairment (isometric and dynamic) and disease activity during the first year after diagnosis of polymyositis (PM) and dermatomyositis (DM), and to study the relationship between muscle impairment, patient-reported health, and disease activity. Methods. Seventy-two patients enrolled in the Swedish Myositis Register, 2003–2010, were followed prospectively. The Manual Muscle test (MMT-8; isometric muscle strength), the Functional Index of myositis test (FI-2; dynamic, repetitive muscle function), and disease activity (6-item core set) were retrieved at the time of diagnosis, and after 6 and 12 months. Self-reported health (Medical Outcomes Study Short Form-36; SF-36) was retrieved at 12 months. Results. At the time of diagnosis, median (Q1–Q3) for the FI-2 was 27.2% (7.9–60.5%) of maximal score compared to 93.8% (92.5–98.8%) of maximal MMT-8. At 12 months, the FI-2 and the MMT-8 improved to 29.4% (16.5–60.7%; p 〈 0.05) and 96.1% (88.1–99.4%), respectively (p 〈 0.01). At 12 months, 45% of patients improved ≥ 20%, and 27% worsened ≥ 20% in FI-2 score, while 10% improved ≥ 20% in MMT-8. Physician’s global visual analog scale (VAS), Health Assessment Questionnaire, and creatine phosphokinase levels improved significantly at 12 months (p 〈 0.05–0.001) while patient’s global and extramuscular VAS remained unchanged. The SF-36 physical function correlated strongly with the FI-2 (r s = 0.74; CI 0.55–0.85) and moderately with the MMT (r s = 0.54; CI 0.27–0.73), with lower correlations between muscle function and other SF-36 domains. Conclusion. Patients with PM/DM were characterized by impaired dynamic repetitive muscle function (DRMF) that correlated well with patient-reported physical function. Assessment of DRMF adds information regarding muscle impairment in these patients.
Type of Medium:
Online Resource
ISSN:
0315-162X
,
1499-2752
DOI:
10.3899/jrheum.161183
Language:
English
Publisher:
The Journal of Rheumatology
Publication Date:
2018
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