Efficacy of intravenous immunoglobulin in the treatment of recurrent spontaneous abortion: A systematic review and meta‐analysis

OBJECTIVE: We aimed to evaluate the efficacy of IVIG in the treatment with patients with recurrent spontaneous abortion (RSA). METHODS: PubMed, Embase, Web of science, Cochrane library were searched for randomized controlled (RCTs) about effect of IVIG on RSA from inception to August 20, 2021. Values of standardized mean differences (SMD) were determined for continuous outcomes. RESULTS: A total of 15 articles involving 902 patients were included in meta‐analysis. Compared with the control group, IVIG can increase the live birth rate of recurrent spontaneous abortion patients [OR = 3.06, 95%CI (1.23, 7.64, P = .02]. However, recurrent abortion was divided into primary and secondary abortion for subgroup analysis, and there was no statistical difference. Besides, IVIG can also increase the expression in peripheral blood CD3+[OR = .4, 95%CI(‐2.47, 3.15, P = .81],CD4+[OR = 1.16, 95%CI(‐4.60, 6.93, P = .69], and a decrease in the expression of CD8+[OR = ‐1.78, 95%CI(‐5.30, 1.75, P = .32], but there is no statistical significance. CONCLUSIONS: IVIG can significantly increase the live birth rate of recurrent spontaneous abortion. However, the evidence needs further verification and the curative effect is uncertain. It is necessary to further explore the pathogenesis of recurrent abortion and the mechanism of IVIG in the treatment of recurrent spontaneous abortion. Besides, more high‐quality randomized controlled trials suitable for population, race, dosage and timing of IVIG in the treatment of recurrent abortion are needed to confirm its effectiveness, and effective systematic evaluation is also needed to evaluate its use benefit.