Acute dilatation of the post partum uterus may occur: (1) during the third stage of labor in which the placenta and membranes are still in utero, and (2) in the early puerperium, uncomplicated by the placenta and membranes which have been discharged.
1. In the third stage of labor, the uterus has a function to perform: the separation and discharge of the placenta and membranes. As the child is being born the fundus follows the child until it is stopped by the bulk of the placenta which it snugly surrounds. The liquor amnii, usually clear, though it may be highly tinged with blood, is discharged, with some bright blood following. The uterus slightly relaxed, globular in shape, and situated below the umbilicus, gives good evidence of muscular tone. After a half dozen pains the placenta and membranes have become separated and are pushed down into the lower uterine segment and
GARDINER JP. ACUTE DILATATION OF POST PARTUM UTERUS AS A CAUSE OF POST PARTUM HEMORRHAGEITS ANALOGY TO ACUTE DILATATION OF THE STOMACH, WITH A SUGGESTION ON THE ACTION OF INVOLUNTARY MUSCLES: PRELIMINARY REPORT. JAMA. 1919;73(26):1915–1918. doi:10.1001/jama.1919.02610520005003
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