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实行自然避孕(NFP)用Billings排卵指标,观察宫颈粘液(CM)反映卵巢激素水平,根据外阴干湿感觉和粘液性状的变化,确定不育期和易育期。最近研究资料提示与该法有关的妊娠率<1%妇女年,显著优于日历节律(CR)法、基础体温(BBT)和症状体温(ST)法。卵巢周期性变化受垂体FSH和LH的控制,垂体又受下丘脑调控,而下丘脑又受大脑神经信号如情绪,环境因素,光暗刺激等以及卵巢及其它内分泌腺的调节。卵巢在黄体期分泌大量的E_2和P抑制
The implementation of natural contraception (NFP) with Billings ovulation indicators observed cervical mucus (CM) reflect ovarian hormone levels, according to the vulva wet and dry feeling and changes in mucus traits, to determine the sterile and easy to fertile period. Recent research suggests that pregnancy rates <1% for women associated with this method are significantly better than the CR, BBT and ST symptoms. Cyclical ovarian changes by the pituitary FSH and LH control, the pituitary and hypothalamic regulation, and the hypothalamus by the brain signals such as emotion, environmental factors, light and dark stimulation, and other ovarian and endocrine regulation. Ovaries secrete large amounts of E_2 and P in the luteal phase