Xu, T., Lun, W., & He, Y. (2024). Subchorionic hematoma: Research status and pathogenesis (Review). Medicine International. https://doi.org/10.3892/mi.2024.134
Xu T, Lun W, He Y. Subchorionic hematoma: Research status and pathogenesis (Review). Medicine International. 2024. doi:10.3892/mi.2024.134
Xu, Tiantian, et al. "Subchorionic hematoma: Research status and pathogenesis (Review)." Medicine International, 2024.
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RRM Academy Synopsis
Subchorionic hematoma is associated with clotting and immune problems
Subchorionic hematoma is associated with clotting problems, immune imbalance and assisted reproduction. A 2024 literature review gathers studies of this early pregnancy condition. Bleeding separates the outer pregnancy membrane from the uterus lining, and blood collects between them. The authors say clear treatment guidelines are lacking.
Key Findings
The review reports a clinical incidence rate of subchorionic hematoma (SCH) of 0.48-39.5%.
In one cited study of 30 patients with SCH, an acquired prethrombotic state (a state of higher clotting risk) during pregnancy was present in as many as 70%.
Another cited study found autoantibodies significantly more common in patients with SCH than in normal pregnant women. High antinuclear antibody titers were more likely a high-risk factor.
Cited findings report higher SCH incidence in pregnancies with assisted reproduction than in natural conception, with frozen embryo transfer and blastocyst transfer increasing the risk of SCH.
Most patients receive symptomatic care. Examples the review lists are stopping uterine contractions, controlling bleeding and preventing infection.
Interpretation
This literature review gathers earlier studies on subchorionic hematoma (SCH). The cited studies link SCH with clotting problems, immune imbalance and assisted reproduction. The authors write that the immune mechanisms behind SCH remain unclear. The authors note that basic research on SCH is limited and mostly addresses how the hematoma affects pregnancy outcomes. The findings support further basic research into these mechanisms.
RRM Context
Restorative reproductive medicine asks why early pregnancy bleeding happens. Cause-based care looks into clotting and immune factors, among others. IVF bypasses the question of why conception was hard. The review cites findings of a higher incidence of these hematomas in pregnancies after assisted reproduction.
Our editorial summary of this paper, not the article's abstract.
Abstract
Subchorionic hematoma (SCH) is a hematoma in which blood accumulates between the chorion and decidua basalis due to the separation of the chorion and decidua basalis. It is common in patients with threatened abortion in early pregnancy and is mainly detected by ultrasound. SCH mainly manifests as an hypoechoic or anechoic crescent-shaped fluid dark area on ultrasound images. Although there are numerous studies on SCH, its pathogenesis and etiology remain unclear, and its influence on pregnancy outcomes is also controversial; there are also no uniform clinical treatment guidelines. Current studies suggest that the occurrence of SCH may be related to several factors, such as abnormal coagulation function, autoimmune factors of pregnant women, assisted reproduction, drug use during pregnancy and reproductive tract infection; however, its exact etiology remains unclear. Some studies suggest that SCH is associated with adverse pregnancy outcomes such as miscarriage, preterm birth, preeclampsia and fetal growth restriction, although other studies have found that SCH does not increase the risk of adverse pregnancy outcomes. Therefore, the present review mainly discusses the pathogenesis, etiology and treatment of SCH in an aim to provide a reference for the clinical treatment of this condition in pregnant women.
