Population
Adult human studies describing the anatomy of the collateral venous system and azygos system
Design
Systematic_review
Authors
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Anatomical review of azygos collaterals clarifies variable supine hypotension susceptibility; extends mechanistic insight into late-pregnancy stillbirth risk but leaves clinical application open.
Anatomical variations in the collateral venous system may render it ineffective during acute IVC occlusion in late pregnancy, potentially contributing to supine hypotension and stillbirth.
Humphries et al. (2017) studied this question.
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