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Characteristic n % Gender Male 4 15.4 Female 22 84.6 Ethnicity Saudi 26 100.0 Age (in years), mean±standard 36.16±13.48 Disease duration, mean±standard deviation 7.18±4.66 Type of myositis Dermatomyositis 16 61.5 Polymyositis 7 26.9 Inclusion body myositis 1 3.8 Anti-synthetase syndrome 2 7.7 Characteristic n % Painless muscle weakness 25 96.2 Gottron’s papules 9 56.3 Heliotrope rash 7 43.8 Dysphagia 10 38.5 Arthritis 7 26.9 Mechanics hands 4 25.0 V sign 3 18.8 Shawl sign 3 18.8 Raynaud’s phenomenon 2 12.5 Holster sign 0 0.0 Cuticular overgrowth 0 0.0 Periungual erythema 0 0.0 Malignancy 0 0.0 Lung disease No involvement 9 69.2 Mild interstitial lung disease 2 15.4 No interstitial lung disease 1 7.7 Interstitial lung disease 1 7.7 Type of autoantibody n % Anti Jo-1 Positive 5 19.2 Negative 21 80.8 Anti-nuclear antibody (ANA) Positive 17 68.0 Negative 8 32.0 ANA pattern Speckled 8 30.8 Nucleolar 5 19.2 Not available 1 3.8 Negative 7 26.9 Homogeneous 5 19.2 - Table 3
- Association between clinical characteristics and idiopathic inflammatory myositis (IIM) types.
Clinical characteristic IIM types DM PM IBM Anti-synthetase P-value n (%) Heliotrope rash (Yes) 7 (100.0) 0 (0.0) 0 (0.0) 0 (0.0) 0.112 Gottron’s papules 9 (100.0) 0 (0.0) 0 (0.0) 0 (0.0) 0.035* V sign 3 (100.0) 0 (0.0) 0 (0.0) 0 (0.0) 0.548 Shawl sign 3 (100.0) 0 (0.0) 0 (0.0) 0 (0.0) 0.548 Raynaud’s phenomenon 1 (50.0) 1 (50.0) 0 (0.0) 0 (0.0) 0.867 mechanics hands 2 (50.0) 0 (0.0) 0 (0.0) 2 (50.0) 0.006** Painless muscle weakness (proximal/distal) 16 (64.0) 7 (28.0) 1 (4.0) 1 (4.0) 0.006** Dysphagia 5 (50.0) 4 (40.0) 1 (10.0) 0 (0.0) 0.237 Arthritis 3 (42.9) 2 (28.6) 0 (0.0) 2 (28.6) 0.096
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