The Correlation of Muscle Biopsy Scores with the Clinical Variables in Idiopathic Inflammatory Myopathies
Suparaporn Wangkaew1, *, Songkiet Suwansirikul2, Kantawut Aroonrungwichian1, Nuntana Kasitanon1, Worawit Louthrenoo1
1 Division of Rheumatology, Department of Internal Medicine, Chiang Mai University, Chiang Mai, Thailand
2 Department of Pathology, Chiang Mai University, Chiang Mai, Thailand
Abstract
Objectives:
To compare the muscle pathology findings among subgroups of idiopathic inflammatory myopathies (IIM) patients, and to determine the correlations of muscle biopsy scores with muscle power and creatine kinase (CK).
Methods:
The medical records of IIM patients consisting of the demographic data, clinical parameters and laboratory conducted were retrospectively reviewed. Their initial muscle biopsies were reviewed, and four domains were scored: inflammation, vascular, muscle, and connective tissue.
Results:
Ninety-five IIM patients (28 patients with idiopathic polymyositis (PM) 9 idiopathic dermatomyositis (DM), 5 DM associated with malignancy, and 53 PM/DM associated with connective tissue disease) with median (IQR: Q1, Q3) disease duration of 1.2 (0.5, 3.1) months were included. No significant differences in initial muscle pathology findings and muscle pathology score among the subgroups were found. Muscle degeneration and endomysial fibrosis scores were negatively correlated with muscle power (r=-0.23 and-0.24, respectively, p<0.05) and positively correlated with CK (r=0.27 and 0.39, respectively, p<0.01). No significant correlation was detected either inflammation or vasculitis scores with muscle power and CK levels.
Conclusion:
In this study, muscle biopsy cannot be used to differentiate among subgroups of IIM patients. In addition, we found only modest correlation of muscle biopsy scores with muscle power and CK. Further study is necessary to confirm our findings.
Keywords: Idiopathic inflammatory myopathies, IIM, Polymyositis, Dermatomyositis, Muscle biopsy, Biopsy score.
Article Information
Article History:
Received Date: 30/06/2016
Revision Received Date: 16/11/2016
Acceptance Date: 16/11/2016
Electronic publication date: 16/12/2016
Collection year: 2016
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* Address correspondence to this author at the Division of Rheumatology, Department of Internal Medicine, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand; Tel: +66-53-946449; Fax: +66-53-227203; E-mail: suparaporn.w@cmu.ac.th