A manual of obstetrics . tage of labor is likewise protractedon account of the atonic condition of the uterine walls;hence the danger of hemorrhage during this stage of thelabor and subsequently. Mechanism of Plural Births.—A question of considerableinterest concerns the positions occupied by the two fetuses and the order of their de-livery. The possible pres-entations in their order offrequency are as follows (thepercentages are those givenby Hirst): Both fetuses pre-sent by the head (Fig. 135)in 49 per cent, of the cases;one presents by the headand one by the breech(Fig. 136) in per cen
A manual of obstetrics . tage of labor is likewise protractedon account of the atonic condition of the uterine walls;hence the danger of hemorrhage during this stage of thelabor and subsequently. Mechanism of Plural Births.—A question of considerableinterest concerns the positions occupied by the two fetuses and the order of their de-livery. The possible pres-entations in their order offrequency are as follows (thepercentages are those givenby Hirst): Both fetuses pre-sent by the head (Fig. 135)in 49 per cent, of the cases;one presents by the headand one by the breech(Fig. 136) in per cent.;both present by the breechin per cent. ; one bythe head and the othertransversely in percent.; one by the breech andone transversely (Fig. 137)in per cent.; and bothtransversely (Fig. 138) in per cent. The cause of thefrequency of abnormal positions (almost 50 per cent, of thecases) is the distortion of the uterine cavity resulting in anincrease in its transverse diameter, and lack of room for the. Fio. 136.—Twins, and breech presentation (Dickinson). PLURAL BIRTHS. 487
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectobstetrics, bookyear1
