A textbook of obstetrics . ictly accurate to-day. It is to Rigby, too, that we owe theterm unavoidable hemorrhage to describe the hemorrhage ofplacenta praevia, as opposed to the accidental hemorrhagefrom premature detachment of a normally situated placenta. Frequency.—Placenta praevia varies in the frequency of itsoccurrence in different localities and at different times, as thefollowing table demonstrates : Cases ofNumber of Placenta Reporter. Labors. Proportion. C. V. Rraun 7,853 15 I-522 Hugenberger 8,036 42 1-191 Lomer 6,862 136 1-50 Winckel (1873-7S) 6,324 7 1-003 Winckel (1879
A textbook of obstetrics . ictly accurate to-day. It is to Rigby, too, that we owe theterm unavoidable hemorrhage to describe the hemorrhage ofplacenta praevia, as opposed to the accidental hemorrhagefrom premature detachment of a normally situated placenta. Frequency.—Placenta praevia varies in the frequency of itsoccurrence in different localities and at different times, as thefollowing table demonstrates : Cases ofNumber of Placenta Reporter. Labors. Proportion. C. V. Rraun 7,853 15 I-522 Hugenberger 8,036 42 1-191 Lomer 6,862 136 1-50 Winckel (1873-7S) 6,324 7 1-003 Winckel (1879-87) 8,500 30 l-^>s3 Miiller 876,432 813 1-1078 lSS° ° °-° Schwarz 5*9,32% 332 1-1564 Midwives report in Saxony 11878) . 119-553 7$ I_I532 526 THE PATHOLOGY OF LABOR. The frequency of placenta praevia may be estimated at aboutI in uoo labors. If the situation of the placenta were investi-gated by a careful examination of the rent in the membranesafter every labor, placenta pnevia would be found quite fire-. Fig. 403.—Central placenta praevia, the OS partly dilated (HunterV quently. In my experience it has occurred about once in 300tabors; but in only a quarter of the cases was the conditionmanifested before and during labor by its most characteristicsymptom, hemorrhage. LABOR COMPLICA TED B YACCIDENTS AND DISEASES. : 2J Etiology.—A perfectly satisfactory explanation for the occur-rence of placenta praevia has not yet been found. Clinical ob-servation shows that any chronic inflammation or congestion of the womb predisposes to it. Hence placenta praevia is three tosix times more common in than in primipar,;-, anmore often met with in the working classes. Uterine myomataand carcinoma of the cervix are predisposing causes, on account,no doubt, of the endometritis that accompanies them. Ingclbyreports two cases of abnormally low situation of the tubal orifices,in one of which placenta previa occurred three times ; in theother, ten. Multiple pregnancie
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