In plain words
Spiral artery remodeling is the process in early pregnancy in which the small arteries that feed the uterus are reshaped. Their thick muscular walls are replaced with a wider, softer lining, so more blood can reach the placenta at lower pressure. The process begins in the first trimester and continues into the second. When it does not happen fully, the placenta may get less blood flow than it needs. This is linked to conditions such as , , and . Mothers do not feel this process, and it cannot be seen or measured at home. It is one reason clinicians look at blood pressure and fetal growth over time.
The deeper version
Spiral artery remodeling involves trophoblast invasion of the maternal and , replacing the smooth muscle and elastic lamina of spiral arterioles with trophoblast-lined vessels of low resistance. The process is incomplete in preeclampsia and fetal growth restriction. Brosens and colleagues (American Journal of Obstetrics and Gynecology, 2011) framed the great obstetrical syndromes as disorders of deep placentation that share this common substrate. , vascular aging, and reduced uterine artery compliance are proposed to impair remodeling. Direct measurement in living pregnancies is limited, so the process is inferred from Doppler indices and clinical outcomes.
Where it comes up
- High blood pressure and preeclampsiaPregnancy: Your Body
- Pregnancy at 35 and olderPregnancy: Your Body
What mothers here say about spiral artery remodeling
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Sources
- Brosens I et al. — The great obstetrical syndromes are associated with disorders of deep placentation. American Journal of Obstetrics and Gynecology 2011