[Histological changes on the wound- and ablatic-areas of the placenta in uterus during the after-labor period].

30 women were examined to determine the postpartal hemostasis during a section caesarea. Immediately after the ablatio of the placenta the wound is covered with tightly adhering blood clots containing a large amount of fibrin. The fibrin have mostly a lamellar structure, there are mainly erythrocytes incorporated. Fibrin can also be found in the neighbourhood of rare aggregates of bloodplatelets and the plugs. Thus the decidua is being covered in varying degrees of intensity, the lumens of the blood vessels are invisible. The obstruction of the vessels contain large amounts of fibrin, platelet thrombi and, in places, erythrocytes, which indicate a mixed form of thrombi. The intravescular thrombi continuously changes into extravascular coagulation process. Residual decidua and trophoblast cells are also involved in the obturation. There are also other changes of blood vessels evident, such as constrictions, deformations, deposits of fibrin on the walls and parietal thrombi. The role of the fibrin on hemostasis is an important one, whereas the importance of the platelets is rather small. After 5 to 15 minutes there is still more fibrin available which supports the hardness increase and stabilization of hemostasis. The mutations are limited to the bed of the placenta and do not go deep, as deep as the wall of the uterus, where the vessels are usually bloodless and narrow. The hemostasis itself is being induced by the separation of the placenta which happens simultaneously with the activities of the muscular system.