Antiphospholipid syndrome (APS) is one of the treatable causes for pregnant women with recurrent pregnancy loss (RPL). This review compares the efficacy of a few treatment interventions (low-dose aspirin (LDA), aspirin plus low molecular weight heparin (LMWH), or unfractionated heparin (UFH)) in preventing complications during pregnancy and miscarriages for women with RPL and APS, and the potential differences in therapeutic effects of UFH and LMWH when combined with aspirin. We searched randomized controlled trials (RCTs) in MEDLINE, EMBASE, and the Cochrane Central Register of Controlled Trials and performed a systematic review and a Bayesian network meta-analysis (NMA). Finally, we found aspirin alone had a lower live birth rate compared to LMWH plus aspirin (OR = 0.37; 95% CrI, 0.17, 0.71), and UFH plus aspirin showed a higher live birth rate than aspirin alone (OR = 2.63; 95% CrI, 1.04, 5.39) in NMA, treating with UFH plus aspirin or LMWH plus aspirin did not have difference on live birth. Furthermore, LDA alone resulted in a lower birthweight compared to heparin plus aspirin, while higher birthweight was found when compared UFH plus aspirin to LMWH plus aspirin (MD = 895.40; 95% CrI, 817.40, 988.57) in NMA. Additionally, in women with RPL and APS and without a prior thrombosis, heparin plus aspirin improved birthweight but could not promote live birth rate compared to aspirin alone. In conclusion, heparin plus aspirin is recommended for women with RPL and APS. Notably UFH plus aspirin demonstrates the most significant therapeutic efficacy among these interventions in improving birthweight.
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