A comprehensive study of the pathomorphology of the corpus, lower segment, and placental bed of the uterus during powerless labor revealed the systematic pattern of uteroplacental complex abnormalities. In powerless labor, tonic uterine tonic component inactivity that develops in the presence of morphofunctional incompetence of the placental bed is determined by inadequate lacunar transformation of venous collectors of the corpus uteri and a forming lower segment. This leads to insufficient blood accumulation in the uterine venous vascular bed and to the development of hypotonic nonproductive birth pangs.
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