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4 Epidemiology and outcome
  1. V STANEVICHA,
  2. A KOKINA,
  3. R SHANTERE,
  4. A SHEGOLEVS
  1. Medical Academy of Latvia
    1. M ANDERSSON,
    2. S MYRNERTS,
    3. A HANSSON,
    4. A FASTH
    1. Department of Paediatrics, University of Göteborg, Göteborg, Sweden

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      4.1 Epidemiology of rheumatological diseases in Latvia

      Objective—To research the epidemiology of rheumatic diseases in children and adolescents aged 1–18 years to obtain comparative data with those of other countries.

      Methods—We used the children's rheumatic diseases register data obtained by 1 January 2000 to determine incidence and prevalence.

      Results—1251 children and adolescents aged 1–18 have rheumatic diseases. 70.4% have been diagnosed juvenile chronic arthritis (JCA), with prevalence 165.1/100 000 and incidence 34.3/100 000. 36% have registered oligoarthritis, 61% polyarthritis (rheumatoid factor positive 5.2%), 2% systemic form arthritis, 0.5% psoriasis with arthritis, 0.5% Crohn's disease and ulcerous colitis with arthritis. Eye injuries in patients with JCA occur in 2.4% of cases. The prevalence of collagenoses is 11.1/100 000 and incidence 2.1/100 000. Recent years show an increase of scleroderma with a prevalence 4.5/100 000. Since 1993 cases of rheumatic fever have increased, reaching a prevalence of 12.6/100 000 and an incidence of 2.1/100 000 in 1999. 49.3% have endocarditis. JCA and collagenoses affect mostly female children, rheumatic fever occurs mostly in male children. Patients with acute arthritis have an incidence of 10.3/100 000. Epstein-Barr virus (9.8%) and streptococcal infection (8.6%) are most common.

      Conclusion—Epidemiological data in children and adolescents with JCA and collagenoses are similar to those of the developed countries, except for a smaller occurrence of eye injuries in patients with JCA. Rheumatic fever with frequent valvular injuries has a comparatively higher occurrence. In 38% of patients the cause of acute arthritis is unknown.

      4.2 High prevalence of childhood chronic arthritis among the Shipibo people of Amazonian Peru

      Few prevalence figures of childhood chronic arthritis exist for developing countries and even fewer for the indigenous population living a traditional life in those countries. We undertook a prospective population based study of the prevalence rate of childhood arthritis among the Shipibo people living in the Amazonian part of Peru.

      Methods—As most adults and children are illiterate and time is vaguely defined as the number of …

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