Low incidence of intrauterine growth restriction in pregnant patients with systemic lupus erythematosus taking hydroxychloroquine

Hydroxychloroquine in Lupus Pregnancy and Risk of Preeclampsia

OBJECTIVE

Systemic lupus erythematosus (SLE) disproportionately affects women during childbearing years, and hydroxychloroquine (HCQ) is the standard first-line treatment. Preeclampsia complicates up to one-third of pregnancies in lupus patients, although reports vary by parity and multifetal gestation. We investigated whether taking HCQ early in pregnancy may reduce the risk of preeclampsia.

METHODS

We studied 1,068 live birth singleton pregnancies among 1,020 privately insured patients with SLE (2007-2016). HCQ treatment was defined as three months preconception through the first trimester, and prescription fills were a proxy for taking HCQ. Modified Poisson regression estimated risk ratios (RRs) and 95% confidence intervals (CIs), stratified by parity. Propensity scores accounted for confounders, and stratified analyses examined effect modification.

RESULTS

Approximately 15% of pregnant patients were diagnosed with preeclampsia. In 52% of pregnancies, patients had one or more HCQ fills. Pregnant patients exposed to HCQ had more comorbidities, SLE activity, and azathioprine treatment. We found no evidence of a statistical association between HCQ and preeclampsia among nulliparous (RR 1.26 [95% CI 0.82-1.93]) and multiparous pregnancies (RR 1.20 [95% CI 0.80-1.70]). Additional controls for confounding decreased the RRs toward the null (nulliparous pregnancy, propensity score-adjusted [PS-adj] RR 1.09 [95% CI 0.68-1.76]; multiparous pregnancy, PS-adj RR 1.01 [95% CI 0.66-1.53]).

CONCLUSION

Using a large insurance-based database, we did not observe a decreased risk of preeclampsia associated with HCQ treatment in pregnancy, although we cannot rule out residual and unmeasured confounding and misclassification. Further studies leveraging large population-based data and prospective collection could characterize how HCQ influences preeclampsia risk in pregnant patients with SLE and among persons at greater risk of hypertensive disorders of pregnancy.

Pregnancy in systemic lupus erythematosus

Systemic lupus erythematosus (SLE) is a chronic autoimmune disease which frequently affects women of childbearing age. Nowadays, pregnancy is not contraindicated in cases of well-controlled disease activity, but pregnancies are still at higher risk of maternal and fetal complications compared to the general population. During pregnancy and puerperium patients are at risk of disease flare, and obstetric complications are more frequent in cases of active disease at conception/beginning of pregnancy, a history of lupus nephritis, and concomitant presence of antiphospholipid syndrome. To improve pregnancy outcomes in SLE patients, appropriate preconception counseling with changes in medication, if necessary, and close rheumatological and obstetrical monitoring are fundamental. This review aims to summarize the risk factors for adverse pregnancy outcomes and provide an update on developments in medical care for pregnancy in SLE patients.

Hydroxychloroquine significantly decreases the risk of preeclampsia in pregnant women with autoimmune disorders: a systematic review and meta-analysis

This meta-analysis aimed to investigate whether hydroxychloroquine (HCQ) intervention could decrease the incidence of preeclampsia and other maternal and fetal outcomes among pregnant women with autoimmune disorders. PubMed, EMBASE, Web of Science, and the Cochrane databases were searched from inception until January 2022. Data on maternal or fetal outcomes of the control and hydroxychloroquine treatment groups were gathered and analyzed. Pooled odds ratio (OR) with 95% confidence intervals (CIs) were determined. Cochran's Q test, I2 statistics, leave-one-out analysis, Baujat plot analysis, GOSH plot analysis, and multivariable meta-regression were applied to assess between-study heterogeneity. The meta-analysis was performed using the Stata V.16.1 software. Baujat plot analysis and GOSH plot analysis were performed using the R V.4.0.0 software. Our study included 21 cohort studies and one case-control study with a total of 3948 pregnancies with immune disorders. HCQ treatment significantly reduced the incidence of preeclampsia (OR 0.45, 95% CI 0.33-0.63, p = 0.000, I2 3.68%). After outlier omission, HCQ treatment significantly reduced the incidence of premature delivery (OR 0.84, 95% CI 0.73-0.96, p = 0.01, I2 44.81%) in pregnant women with autoimmune disorders. In sub-group analysis, HCQ also significantly reduced the incidence of gestational hypertension (OR 0.42, 95% CI 0.26-0.68, p = 0.001, I2 49.33%) and preterm birth (OR 0.63, 95% CI 0.48-0.82, p = 0.001, I2 27.63%) in pregnant women with lupus. The heterogeneity of the findings mentioned above was low to moderate. There were no significant differences in the risk of other outcomes, including gestational diabetes, HELLP syndrome, thrombosis, spontaneous abortion, fetal loss, small for gestational age infant (SGA), low birth weight, stillbirth, APGAR score < 7, and congenital malformation. This meta-analysis indicated that HCQ treatment could significantly decrease the incidence of preeclampsia and premature delivery in pregnant women with autoimmune disorders. In addition, HCQ could reduce the risk of gestational hypertension in pregnant lupus patients.

Effect of Hydroxychloroquine on Lupus Activity, Preeclampsia and Intrauterine Growth Restriction in Pregnant Women with Systemic Lupus Erythematosus and/or Antiphospholipid Syndrome: A Systematic Review and Meta-Analysis

BACKGROUND

Hydroxychloroquine (HCQ) has been used in the treatment of systematic lupus erythematosus (SLE) and antiphospholipid syndrome (APS), but its effect on lupus activity during pregnancy, preeclampsia and intrauterine growth restriction (IUGR) remains unclear.

METHODS

PubMed, Embase and Cochrane databases were searched before 11 September 2022 for randomized clinical trials (RCT) or observational studies involving additional HCQ treatment and pregnant women diagnosed as having SLE and/or APS/positive antiphospholipid antibodies (aPLs). Risks of high lupus activity, preeclampsia and IUGR were explored.

RESULTS

One RCT and 13 cohort studies were included. A total of 1764 pregnancies were included in the pooled meta-analysis (709 in the HCQ group vs. 1055 in the control group). After the additional use of HCQ, the risk of high lupus activity decreased (RR: 0.74, 95% CI: 0.57-0.97, p = 0.03). For preeclampsia, the total incidence decreased (RR: 0.54, 95% CI: 0.37-0.78, p = 0.001). The subgroup analysis showed statistical significance in the SLE subgroup (RR: 0.51, 95% CI: 0.34-0.78, p = 0.002) but not in the APS/aPLs subgroup (RR: 0.66, 95% CI: 0.29-1.54, p = 0.34). For IUGR, the decrease in incidence was not statistically significant (RR: 0.80, 95% CI: 0.47-1.35, p = 0.46), neither in the SLE subgroup (RR: 0.74, 95% CI: 0.40-1.36, p = 0.33) nor in the APS/aPLs subgroup (RR: 1.26, 95% CI: 0.34-4.61, p = 0.73).

CONCLUSION

The additional use of HCQ may decrease the risk of high lupus activity during pregnancy and the incidence of preeclampsia for SLE patients, but the results do not support that using HCQ decreases the incidence of preeclampsia for APS/aPLs patients or reduces IUGR risk for SLE and/or APS/aPLs patients.

Undifferentiated Connective Tissue Disease in Pregnancy: A Topic Yet to be Explored

Undifferentiated connective tissue disease (UCTD) is characterized by signs and symptoms suggestive of a connective tissue disease (CTD), but not fulfilling criteria for a specific CTD. Although UCTD is probably the most common rheumatic disease diagnosed in pregnant women, data about disease course during pregnancy and perinatal outcomes are very limited. Compared to other CTDs, UCTD seems to have milder clinical manifestations in pregnancy. Its natural history is related to disease activity at conception. In fact, if the disease is in a state of remission or minimal activity at conception, pregnancy outcomes are generally good. On the contrary, patients who become pregnant in a moment of high disease activity and/or who have multiple antibodies positivity show an increased risk of disease flares, evolution to a definite CTD and obstetric complications, such as fetal growth restriction, preeclampsia and preterm birth. Therefore, a preconception assessment is essential in women with UCTD to evaluate maternal and fetal risks, to initiate interventions to optimize disease activity, and to adjust medications to those that are least harmful to the fetus. The aim of the present study was to review the available literature about pregnancy course, maternal and fetal outcomes and therapeutic approaches of pregnant women with UCTD.

The Potential Benefit of Hydroxychloroquine in Chronic Placental Inflammation of Unknown Etiology Associated with Adverse Pregnancy Outcomes

The placenta is the site of connection between maternal and fetal circulation, and the liaison is established early in pregnancy. A large variety of pregnancy complications such as preterm birth, fetal growth restriction, or pregnancy loss have placental expression and can be accompanied in some cases of acute or chronic identifiable placental inflamatory lesions. Chronic placental inflammatory (CPI) lesions include chronic villitis of unknow etiology (CVUE), chronic intervillositis of unknown etiology, CIUE (also described as chronic histiocytic intervillositis, CHI), and chronic deciduits. Hydroxychloroquine (HCQ) has been prescribed with good results during pregnancy to prevent adverse perinatal outcomes in maternal autoimmune conditions. Its success has paved the way to its use in CPI as CIUE/CHI; however, to date, there are no prospective, informatively designed, controlled studies on its value in these setting. This review aims to explore the potential role of HCQ in CPI of unknown etiology. Ideally, properly designed, probably multicentric studies should be undertaken to fully understand HCQ's role for prevention of adverse pregnancy outcomes after a chronic placental inflammation.