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 Sjogren’s syndrome with keratoconjunctivitis sicca may be seen.

VARIANTS OF SYSTEMIC SCLEROSIS

MORPHOEA

CREST SYNDROME consists of calcinosis (C), Raynaud’s phenomenon (R), oesophageal involvement (E), sclerodactyly (S) and telangiectasia (T). Antinuclear antibodies to the centromere are found in the blood.

MIXED CONNECTIVE TISSUE DISEASE

INVESTIGATION

SERUM ANTINUCLEAR ANTIBODIES are often positive. Antinucleolar and anticentromere antibodies are specifically elevated. A positive rheumatoid factor is found in 30% of cases.
A NORMOCHROMIC NORMOCYTIC ANAEMIA can be seen. An acquired haemolytic anaemia with ‘cold’ agglutinins may occur. The ESR may be raised.
X-RAYS OF THE HANDS may show deposits of calcium around the fingers. In severe cases there is erosion and resorption of the tufts of the distal phalanges.
BARIUM SWALLOW to detect oesophageal involvement is often a useful confirmatory test.

TREATMENT

No treatment has been shown to influence the progress of this condition. Management is therefore symptomatic.

PROGNOSIS

In some patients the disease is mild, whilst in others it is severe and complicated by systemic features such as renal disease. The mean 5-year survival rate is 50%.

Polymyositis and dermatomyositis

Polymyositis is a disorder of muscle in which the pathological features are necrosis of muscle fibres together with evidence of regeneration and inflammation, particularly around blood vessels. It presents with proximal muscular wealcness and wasting. When this is accompanied by a rash, it is called dermatomyositis. Its incidence is comparable with that of systemic sclerosis, i.e, it is less common than SLE. It occurs at any age, even in children, but with a peak incidence in adults aged between 30 and 60 years. It is twice as common in women as in men.

AETIOLOGY

The aetiology is, unknown, but immunological and viral factors have been suggested. Dermatomyositis is associated with an increased incidence of carcinoma of the bronchus in men or of the ovary in women, mainly in patients presenting after 50 years of age.

CLINICAL FEATURES

The major feature of polymyositis is muscle wealcness and wasting affecting the proximal muscles of the shoulder and pelvic girdles. It may be very acute in onset, particularly in children, and is sometimes accompanied by myoglobinuria. In the chronic form there is gradually progressive muscular wealcness. Muscle pain and tenderness are found in about one-half of the cases, but weakness is the chief complaint. The rash of dermatomyositis is characteristic (see p. 1022). As in other connective tissue diseases, systemic features are often found:
ARTHRALGIA OR ARTHRITIS occur in about half of all patients and may be the presenting feature, occurring before the onset of the muscular symptoms. The small joints of the hands are particularly affected but the arthritis may extend in a distribution resembling that of RA. Joints are often swollen but the arthritis is intermittent and not progressive.
DYSPHAGIA is found in 50% of cases and is due to oesophageal muscle involvement.
RAYNAUD’S PHENOMENON is common.
SJOGREN’S SYNDROME AND RESPIRATORY PROBLEMS may occur.

INVESTIGATION

The diagnosis of polymyositis is made on the basis of three tests, two of which at least should be positive:

1 Muscle enzymes. Serum creatine phosphokinase and aldolase are raised and can be used to follow the progress of the disease during treatment.
2 EMG. Short polyphasic motor potentials, sometimes spontaneous fibrillation and high-frequency repetitive discharges (see p.951) are almost pathognomonic of polymyositis.
3 Muscle biopsy. This shows necrosis of muscle fibres with swelling and disruption of muscle cells. Vacuolation, fragmentation and fibrosis of the fibres are seen, with thickening of the blood vessels. There are also inflammatory changes.

Other tests

THE ESR IS USUALLY RAISED. A normochromic normocytic anaemia and a polymorphonuclear leucocytosis are seen in acute cases.
SERUM ANTINUCLEAR ANTIBODIES AND TESTS FOR RHEUMATOID FACTOR may be positive.

MANAGEMENT

Systemic corticosteroids, starting with 60 mg of prednisolone daily and reducing to a maintenance dose of about 15 mg daily are used. In most cases this produces a gradual remission of the disease. Physiotherapy may be required to restore muscle power. Treatment is required for a variable period, usually months but sometimes years. Some patients fail to respond to steroids, and immunosuppressive drugs such as methotrexate or aiathioprine may be required.

PROGNOSIS

Fifty per cent of affected children die within 2 years. In adults the prognosis is better, except in association with malignancy.

Mixed connective tissue disease

The existence of this rare disorder emphasizes the overlap between the connective tissue diseases, although it may not itself be a distinct entity. It is a useful term for cases with features of more than one of the connective tissue diseases together with high titres of antibody to an extractable nuclear antigen such as RNP. Like the other conditions, it affects women more often than men and presents in young adults.

Clinical features include arthralgia, Raynaud’s

phenomenon, proximal muscle weakness and wasting, and a puffy swelling of the skin of the hands that somewhat resembles the changes occurring in scleroderma. Other features of SLE, polymyositis or scleroderma may appear, but serious problems such as renal disease are unusual.
The condition tends to be benign and often responds well to small doses of prednisolone.

Primary Sjogren’s syndrome

The syndrome of dry eyes (keratoconjunctivitis sicca), in the absence of RA, is known as primary Sjogren’s syndrome. There is an association with HLA-B8, DR3. Dryness of the mouth, skin or vagina may also be a problem.Salivary and parotid gland enlargement is seen.  Systemic associations include:

• Arthralgia and occasionally non-progressive polyarthritis like that seen in SLE
• Raynaud’s phenomenon
• Dysphagia and abnormal oesophageal motility as seen in systemic sclerosis
• Other organ-specific autoimmune diseases, including thyroid disease, myasthenia gravis, primary biliary cirrhosis and chronic active hepatitis
• Renal tubular defects causing nephrogenic diabetes insipidus and renal tubular acidosis
• Pulmonary diffusion defects and fibrosis
• Polyneuropathy, fits and depression
• Vasculitis
• Increased incidence of lymphoma

PATHOLOGY

Biopsies of the salivary gland or of the lip show a focal infiltration of lymphocytes and plasma cells.

DIAGNOSIS

THE SCHIRMER TEAR TEST, in which a standard strip of filter paper is placed on the inside of the lower eyelid; wetting of less than 10 mm in 5 min indicates defective tear production
ROSE BENGAL STAINING of the eyes showing punctate or filamentary keratitis
LABORATORY ABNORMALITIES include raised immunoglobulin levels, circulating immune complexes and many autoantibodies. Rheumatoid factor is usually positive, antinuclear antibodies are found in 60-70% and antimitochondrial antibodies in 10% of cases. Anti-Ro (SSA) antibodies are found in 70% of cases compared with 10% of cases of RA and secondary Sjogren’s syndrome. This antibody is of particular interest because it can cross the placenta and cause congenital heart block.

Posted by: brianna

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