A textbook of obstetrics . Fig. 397.—Twins ; breech and face presentations. Multiple Births.—Twin labors are usually easy and uncom-plicated (75 per cent.), but complications are more frequentthan in single labors. Malpresentations are common. Thefollowing table from Spiegelberg, based on 1138 labors, givesthe combined presentations in the order of their frequency: Both heads presenting, 4 percent Head and bree< h, . ... 31.70 Both pelvic presentations, 8.60 Head and transverse 6.lS Breech and transverse, 4-*4 Both transverse, 35 ANOMALIES IX THE FORCES OF LABOR, 59 It may be noted that a t
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A textbook of obstetrics . Fig. 397.—Twins ; breech and face presentations. Multiple Births.—Twin labors are usually easy and uncom-plicated (75 per cent.), but complications are more frequentthan in single labors. Malpresentations are common. Thefollowing table from Spiegelberg, based on 1138 labors, givesthe combined presentations in the order of their frequency: Both heads presenting, 4 percent Head and bree< h, . ... 31.70 Both pelvic presentations, 8.60 Head and transverse 6.lS Breech and transverse, 4-*4 Both transverse, 35 ANOMALIES IX THE FORCES OF LABOR, 59 It may be noted that a transverse position is found in 10.67 percent, of cases. Mechanical difficulties in labor are frequent: theuterine muscle is usually weakened by overstretching, and theremay be trouble in the third stage of labor in the delivery of the placenta. Some form of operative interference is demanded inabout 25 per cent, of all cases.. Fig. 398.—Impaction of heads in twin labor.