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Connective Tissue Diseases
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Connective tissue diseases (CTDs) are a group of disorders affecting the body’s structural tissues, including skin, muscles, joints, and blood vessels. Common features include joint pain, muscle weakness, skin rashes, and fatigue. Early recognition is crucial to prevent long-term damage and improve quality of life. Diagnosis typically relies on clinical evaluation, laboratory testing, and imaging studies. Treatment strategies aim to control inflammation, manage symptoms, and protect organ function.
Insights on CTDs
Connective tissue diseases (CTDs) are Systemic Autoimmune Rheumatic Diseases (SARDs), a group of disorders characterized by inflammation and autoimmune reactions that affect multiple organ systems. These diseases involve the immune system attacking the body’s tissues, leading to widespread inflammation and damage. The most common SARDs are:
- Systemic Lupus Erythematosus (SLE), a chronic autoimmune disease that can affect the skin, joints, kidneys, brain, and other organs, with symptoms like fatigue, joint pain and swelling, skin rashes (especially a butterfly-shaped rash on the face), photosensitivity, fever, and organ involvement such as nephritis and pericarditis.
- Systemic Sclerosis (Scleroderma), an autoimmune disease characterized by fibrosis (thickening and hardening) of the skin and internal organs.
- Sjögren’s disease, that primarily affects the glands that produce saliva and tears.
- Polymyositis and Dermatomyositis, inflammatory myopathies that cause muscle inflammation and weakness. Dermatomyositis is associated with a distinctive skin rash.
- Mixed Connective Tissue Disease (MCTD), a disease featuring overlapping symptoms of SLE, Scleroderma, and Polymyositis, with specific autoantibodies (anti-RNP-70).
- Autoantibodies against cellular components, anti-nuclear antibodies (ANA), are important serological markers for CTD. Target antigens include nucleic acids, cell nuclear proteins and ribonuclear proteins as well as components of the cytoplasm.
Connective tissue diseases are chronic immune disorders that damage tissues and organs, profoundly affecting quality of life.
3-5%
prevalence of autoimmune disorders in the general population
10:1
is the women-men ratio for specific autoimmune disorders
5
million people are affected by SLE
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Instruments for diagnosing Connective Tissue Diseases
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References
a) Damoiseaux J. The International Consensus on ANA Patterns (ICAP): from conception to implementation. Clin Chem Lab Med. 2023 Nov 17;62(5):789-792.
b) Bossuyt X, De Langhe E, Borghi MO, Meroni PL. Understanding and interpreting antinuclear antibody tests in systemic rheumatic diseases. Nat Rev Rheumatol. 2020 Dec;16(12):715-726.
c) Bonroy C, Vercammen M, Fierz W, Andrade LEC, Van Hoovels L, Infantino M, et al.; European Federation of Laboratory Medicine (EFLM) Working Group “Autoimmunity Testing,” the European Autoimmune Standardization Initiative (EASI) and International Consensus on Antinuclear Antibody Patterns (ICAP). Detection of antinuclear antibodies: recommendations from EFLM, EASI and ICAP. Clin Chem Lab Med. 2023; 61(7): 1167-1198.
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