Abstract
Introduction: To describe the maternal and fetal outcomes in systemic lupus
erythematosus (SLE) pregnancies followed-up in a single tertiary referral centre.
Methods: We performed a retrospective cohort study of 75 SLE pregnancies who
were followed up in Singapore General Hospital over a 16-year period from 2000 to
2016. Adverse fetal and maternal outcomes including preterm delivery, miscarriages,
fetal growth restriction, congenital heart block, neonatal lupus, pre-eclampsia and SLE
flares were obtained from the medical records.
Results: The mean age at conception was 32 years old (SD 3.8). The mean SLE
disease duration was 5.9 years (SD 5.2). The majority (88%) had quiescent SLE
disease activity at baseline. Most pregnancies resulted in a live birth (74.7%). The mean
gestational age at birth was 37.4 weeks (SD 3.4). Adverse fetal outcomes occurred
in 53.3%. Preterm delivery (33.9%), miscarriages (20%) and fetal growth restriction
(17.3%) were the most frequent adverse fetal outcomes. There was 1 neonatal death
and SLE flares occurred in a third (33%). In the subgroup of SLE pregnancies with
antiphospholipid syndrome, there were higher SLE flare rates (40%) and adverse fetal
outcomes occurred in 8 pregnancies (80%). There were no predictive factors identified for
all adverse fetal and maternal outcomes. In the subgroup analysis of preterm delivery,
anti-Ro (SS-A) antibody positivity and hydroxychloroquine treatment were associated
with a lower risk of preterm delivery.
Conclusion: Although the majority had quiescent SLE disease activity at baseline,
SLE pregnancies were associated with high rates of adverse fetal and maternal outcomes.
Keywords: Antiphospholipid syndrome, anti-La (SS-B) antibody, anti-Ro (SS-A) antibody,
lupus nephritis