为了最大限度地提高1.5毫克Levonorgestrel在紧急避孕中的有效性:早产前使用的情况
Douglas J Taylor1, Nathalie Kapp2, Markus J Steiner1
1FHI 360, Product Development and Introduction Department, Durham, NC, United States.
Contraception: X
|July 2, 2024
概括
在性行为前几个小时服用紧急避孕药 (EC) 可以显著提高其预防怀孕的有效性. 这种主动的方法,使用1.5毫克的levonorgestrel (LNG-EC),是当前推先进的EC供应的逻辑延伸.
科学领域:
- 生殖健康 生殖健康
- 药理学 药理学是指药理学的学科.
- 数学建模的数学建模
背景情况:
- 目前的指导方针建议先进的应急避孕 (EC) 供应以尽量减少使用延迟.
- 在未受保护的性交后服用1.5毫克Levonorgestrel (LNG-EC) 的有效性已得到充分证实.
- 需要在预期的未受保护的性活动之前积极探索使用LNG-EC的潜在好处.
研究的目的:
- 描述1.5毫克勒沃诺格斯特勒 (LNG-EC) 在不保护性行为前几个小时内服用时可能改善的疗效.
- 为了比较在性交前使用LNG-EC的模拟有效性与在性交后使用的现有数据.
- 评估时间对LNG-EC最大可实现效率的影响.
主要方法:
- 扩展现有的LNG-EC有效性的数学模型,假设排卵中断是主要机制.
- 模型输出与9项关于性交后使用LNG-EC (性交后长达72小时) 研究的点估计结果的比较.
- 在不保护性行为前3小时内服用LNG-EC的疗效建模.
主要成果:
- 立即性交后使用LNG-EC可能会将意外怀孕的风险降低91%.
- 由于治疗延迟,LNG-EC在结合后的平均最大有效率在49%至67%之间.
- 如果一半的受试者在性行为前3小时服用LNG-EC,最大的有效率水平将增加到70%至81%的范围内.
结论:
- 在预期的无保护性行为前几个小时服用LNG-EC是当前推先进EC供应的逻辑延伸.
- 积极,性交前使用LNG-EC可以进一步降低意外怀孕的可能性.
- 在没有进一步的临床数据的情况下,不建议常规依赖性交前的LNG-EC,除非现代避孕药无法获得.
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