To evaluate the effect of pregnancy on systemic lupus erythematosus (S
LE) activity, the authors studied 35 patients with definite SLE (ARA c
riteria, 1982). SLE activity was estimated every trimester of pregnanc
y and 3-14 months after the delivery. The disease activity was judged
by scores (SLEDAI, version I and II) and by an increase in prednisolon
e dose more than 5 mg/day. The activity score elevated in 31% (SLEDAI
I) or in 17% (SLEDAI II) during pregnancy was similar to frequency of
flares after the child's birth (34% or 23%, respectively). In 22 (63%)
of 35 patients the steroid dosage was increased during pregnancy vers
us 3 (8.5%) patients postpartum. The most frequent SLE complications o
bserved in pregnancy were renal, CNS and mucocutaneous disorders. The
frequency of SLE exacerbations and outcomes of pregnancy were related
to the disease activity in conception.