当子宫开始有规律的收缩一直到胎盘娩出都算是自然分娩的全过程，是真正分娩前的一个漫长前奏，不同的人分娩所需的时间是不同的。第一产程初产妇约需11～12小时，经产妇约需6～8小时，这是整个过程中时间最长的产程。
目的探讨第一产程异常胎心监护图形与新生儿结局的关系。
Objective To investigate the relationship between abnormal fetal heart rate (FHR) tracing patterns during the first stage of labor and perinatal outcome.
结论在第一产程使用分娩球运动能提高分娩率，减轻疼痛，缩短产程。
Conclusion the use of labor ball can enhance the rate of vaginal parturition, relieve the labor pain and shorten the labor course.
结果：观察组手术产率、产后出血率低、第一产程活跃期短、满意度高。
Results: Operation rates and postpartum hemorrhage rates of the experiment group is lower, with shorter first stage active phase and higher satisfaction.
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