Does rheumatoid arthritis remit during pregnancy and relapse postpartum? Results from a nationwide study in the United Kingdom performed prospectively from late pregnancy

Objective, To ascertain the influence of pregnancy on disease activity in w omen with rheumatoid arthritis (RA) during pregnancy and postpartum. Methods, One hundred forty pregnant women were recruited from a nationwide campaign and were followed prospectively in the last trimester and at 1 and 6 months postpartum. Standardized assessment of joint symptoms, examinatio n of inflamed joints, and the Health Assessment Questionnaire (HAQ) were th e main measures of disease activity. Results. There was only a modest fall in HAQ scores during pregnancy, with >25% of women having substantial levels of disability. Other parameters of disease activity showed a greater trend toward improvement, although only 2 3 (16%) were in complete remission (no joints with active disease and no th erapy). Similarly, there was relatively little change in the distribution o f HAQ scores from pregnancy to postpartum There was, however, a statistical ly significant increase in the mean number of inflamed joints compared with the findings during pregnancy. Analysis of the possible influence of treat ment suggested that therapy was associated with more severe disease and was not related to reduction in disease activity. Conclusion, This, the largest prospective study of the influence of pregnan cy on RA activity, has demonstrated widespread variability in disease respo nse.