Can pregnancy induce relapse in systemic lupus erythematosus (SLE)?

Systemic lupus erythematosus (SLE) is a chronic autoimmune disease which mostly affects women of reproductive age. We evaluated the impact of pregnancy on maternal/fetal health, the pattern of organ involvements and the fare-up risk.
In a retrospective study we studied the thirty-year medical records of patients between 1976-2005. Maternal, neonatal and infantile health data was retrieved. Incidence of flare-ups, pattern of organ involvements and the outcome of pregnancy was analyzed.
We studied 155 pregnancies in 129 SLE patients. Mean age of patients was 27.0 ± 5.5 years (range, 16-44). Thirty one cases (20.2%) experienced flares in the course of pregnancy. During pregnancy, SLE disease activity index (SLEDAI) score increased in 92 (59.3%) patients (median increase = 6 scores). On the other hand, 38 cases (24.5%) SLEDAI score remained unaltered and in 25 cases (16.1%) SLEDAI score decreased (median decrease = 1). Mean SLEDAI during pregnancy were significantly higher than preconceptional scores (P-value = 0.002).Term delivery was more common in quiescent SLE (54.2% vs. 34.6%, P-value = 0.04). Number of therapeutic abortions was higher in active SLE (38.5% vs. 10.2% P-value = 0.003).
In this study increased SLEDAI and flare-up episodes were observed during pregnancy. However the majority of cases did not face major fetal or maternal complications.