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Clinical features of new-onset systemic lupus erythematosus during pregnancy in Central China: a retrospective study of 68 pregnancies

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Abstract

The aim of this study is to explore the clinical features and pregnancy outcomes of Chinese patients with new-onset systemic lupus erythematosus (SLE) during pregnancy or puerperium. We retrospectively evaluated the data of all pregnant women with SLE managed at the First Affiliated Hospital of Zhengzhou University between April 2013 and March 2017. Clinical characteristics, laboratory features, medication use, and pregnancy outcomes were compared between pregnant women with new-onset SLE and pregnant women with pre-existing SLE. Risk factors for adverse pregnancy outcomes were determined using binary regression analyses. Overall, 223 pregnancies in 216 patients were included; 148 (69.6%) patients had a history of SLE, and 68 (30.4%) were diagnosed with SLE during pregnancy or puerperium. Most cases of new-onset SLE (72.1%) occurred during the first and second trimesters. Thrombocytopaenia (especially severe thrombocytopaenia) (76.5% vs 54.2%, P = 0.008; 39.7% vs 15.5%, P = 0.001) and anaemia (especially moderate anaemia) (73.5% vs 56.9%, P = 0.007; 52.9% vs 35.2%, P = 0.035) were more common in women with new-onset SLE than in women with pre-existing SLE and active disease during pregnancy. Additionally, patients with new-onset SLE experienced higher rates of moderate-to-severe disease activity than patients with pre-existing SLE (P < 0.01); disease activity occurred mostly during the first and second trimesters (75.4%). Compared with pre-existing SLE patients, disease activity in new-onset SLE patients occurred mostly in the first trimester (33.3% vs 15.3%, P = 0.043) and less in the third trimester (21.1% vs 47.2%, P < 0.001). Pregnancy loss was significantly higher in patients with new-onset SLE than in patients with pre-existing SLE (62.4% vs 27.1%, P < 0.001), with most cases occurring during the first and second trimesters (95.3%). However, there were no significant differences in neonatal outcomes between new-onset and pre-existing SLE patients with active disease. Within the new-onset SLE group, active disease was an independent risk factor for pregnancy loss (odds ratio [OR] = 16.185, confidence interval [CI] = 1.895–138.232, P = 0.011), whereas disease onset at late gestation was a protective factor against pregnancy loss (OR = 0.589, CI = 0.435–0.796, P = 0.013). Patients with new-onset SLE suffered greater haematological involvement (mainly thrombocytopaenia and anaemia) and higher rates of moderate-to-severe disease activity and pregnancy loss than patients with pre-existing SLE. Controlling disease activity and extending gestational age may improve pregnancy outcomes in women with new-onset SLE.

Key Points

• The clinical features of new-onset SLE during pregnancy and its impact on pregnancy outcomes have rarely been reported, especially in Chinese patients.

• New-onset SLE during pregnancy in Chinese women occurred primarily during the first and second trimesters and was characterised by haematological disorders, including thrombocytopaenia and anaemia.

• Women with new-onset SLE during pregnancy had significantly higher disease activity scores and pregnancy loss rates than women with pre-existing SLE, especially during the first and second trimesters; controlling disease activity and prolonging gestational age may improve pregnancy outcomes in this setting.

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Funding

This work was supported by the National Natural Science Foundation of China (grant no. 71673254), National Key R&D Program of China (grant no. 2017YFC0909900), and Provincial Health Planning Commission (grant no. Wjlx2016060).

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Correspondence to Guanmin Gao.

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He, X., Jiang, D., Wang, Z. et al. Clinical features of new-onset systemic lupus erythematosus during pregnancy in Central China: a retrospective study of 68 pregnancies. Clin Rheumatol 40, 2121–2131 (2021). https://doi.org/10.1007/s10067-020-05452-2

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