Undifferentiated connective tissue disease overview
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief:
Overview
Historical Perspective
Undifferentiated connective tissue disease(UCTD) was first explored by LeRoy et al in 1980.
Classification
Undifferentiated connective tissue disorder(UCTD) are actually a group of disorders that are unclassified in other connective tissue disorders. UCTD may be classified according to criteria developed by American College of Rheumatology(ACR) and European League Against Rheumatism(EULAR) : early Raynaud's phenomenon, early inflammatory arthritis that is not classified as rheumatoid arthritis, some manifestations same as that of inflammatory myopathy, systemic lupus erythematosus, Sjögren's syndrome, vasculitis, serositis, or interstitial lung disease which don't meet diagnostic criteria for each of them and early scleroderma.
Pathophysiology
The exact pathogenesis of undifferentiated connective tissue disorder(UCTD) is not fully understood. It is understood that UCTD is the result of autoimmune process and occurs in phases: Initial phase: which is asymptomatic and absence of auto-antibodies and second phase with the presence of auto-antibodies. The second phase is usually triggered by the environmental factors, such as infection. Auto-antibodies appear before the symptoms of the disease.The time between the two is variable. Autoantibodies usually seen in UCTD with positive correlation are antibodies against C1q ,Anti heat shock protein(hsp)-65, Anti hsp 60. The clinical picture involves the overlap of symptoms of other rheumatological disease but not completing the criteria of their diagnosis. More studies are needed to find the pathogenesis of UCTD.
Causes
The cause of undifferentiated connective tissue disease has not been identified.
Differentiating Xyz from Other Diseases
UCTD is differentiated with other causes of arthritis and rash such as SLE, Sjögren's syndrome, Rheumatoid arthritis.
Epidemiology and Demographics
Risk Factors
There are no established risk factors for UCTD.
Screening
There is insufficient evidence to recommend routine screening for undifferentiated connective tissue disease.
Natural History, Complications, and Prognosis
The symptoms of undifferentiated connective tissue disease(UCTD) usually are similar to connective tissue diseases but couldn't complete the criteria for their definitive diagnosis. If left untreated, 24.3-33% of patients with UCTD may progress to develop manifestations of well defined connective tissue disease such as systemic lupus erythematosus, rheumatoid arthritis, Sjögren's syndrome. Common complications of UCTD include Interstitial lung disease- Non specific interstitial pneumonia, atherosclerosis. Depending on the extent of the UCTD at the time of diagnosis, the prognosis may vary. However, the prognosis is generally regarded as good. The presence of interstitial lung disease is associated with a particularly good prognosis among patients with UCTD rather than being idiopathic.