. On the theory and practice of midwifery . uppress any return of thehemorrhage, and to enable us to guard against any subsequent attack;for it should always be borne in mind that hemorrhage is by no means aguarantee against inflammation afterwards. 654. 2. Unavoidable Hemorrhage. Placenta prcevia, placental pre-sentation, &c.—In this variety, the flooding is the necessary consequenceof the dilatation of the os uteri, by which the connection between theplacenta and uterus is separated, and the more the labour advances, thegreater the disruption, and the more excessive the hemorrhage. Fromthis
. On the theory and practice of midwifery . uppress any return of thehemorrhage, and to enable us to guard against any subsequent attack;for it should always be borne in mind that hemorrhage is by no means aguarantee against inflammation afterwards. 654. 2. Unavoidable Hemorrhage. Placenta prcevia, placental pre-sentation, &c.—In this variety, the flooding is the necessary consequenceof the dilatation of the os uteri, by which the connection between theplacenta and uterus is separated, and the more the labour advances, thegreater the disruption, and the more excessive the hemorrhage. Fromthis very circumstance it follows that the danger is much greater than inthe former cases, and also that what in them was the natural mode ofrelief, is here an aggravation of the evil, and cannot be employed as aremedy. In these cases the placenta may be situated partially, or entirely overthe os uteri (fig. 137), or it may come down only to the edge of the cervixuteri; and there is some difference in the management accordingly. Fig. That the placenta was occasionally found at the os uteri was known asearly as the time of Guillemeau, Mauriceau, Deventer, Pugh, &c, butthey believed that it had originally been situated differently, but had beendetached and fallen down. Paul Portal first spoke of it as adhering tothis part, in consequence of which he was obliged to deliver by , Levret, Roederer, and Smellie were also cognizant of this fact,and they seem to have been aware of the mode in which the hemorrhage UNAVOIDABLE HEMORRHAGE. 427 was produced, and of its inevitable occurrence. But it is undoubtedlyto Dr. Rigby, of Norwich, that the profession is indebted for the full andclear elucidation of the subject. Time, which is the great test of merit,has only confirmed the truth of his observations, and illustrated the valueof his essay. 655. The cause of the hemorrhage is evidently the separation of theplacenta from the cervix uteri, and the exposure of the mouths of th
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