估计第三阶段管理对产后出血的因果影响在助产背景下:用于构建指向循环图的证据综合方法
Vanessa Hébert1,2, Irina I Oltean1, Giulia M Muraca1,3,4
1Department of Health Research Methods, Evidence and Impact, Faculty of Health Sciences, McMaster University, Hamilton, Ontario, Canada.
Paediatric and perinatal epidemiology
|September 17, 2025
概括
这项研究使用因果定向非循环图 (DAG) 来确定关键变量,以估计第三阶段管理对产后出血 (PPH) 的影响. 开发的DAG在比较生理护理与催产素预防方面最大限度地减少了偏见.
科学领域:
- 产科和妇科 产科和妇科
- 流行病学 流行病学
- 因果推理因果推理
背景情况:
- 使用观察数据估计第三阶段管理对生理出生的产后出血 (PPH) 的因果影响是复杂的.
- 分析的变量选择依赖于关于因果途径的未陈述假设.
研究的目的:
- 应用证据综合来构建指向非循环图 (DAG) 的方法.
- 开发一个因果DAG,澄清假设并确定最小调整集.
- 减少在估计生理第三阶段护理与催产素预防对PPH的因果关系方面的偏差.
主要方法:
- 随机和非随机研究的系统审查 (MEDLINE,Embase,CINAHL,科学网,Cochrane,临床试验.
- 基于非随机研究的DAG开发,结合了专家咨询和助产士专业知识.
- 将单个DAG合成一个集成的DAG,确定最小足够的调整集.
主要成果:
- 四个非随机化研究被纳入了DAG开发.
- 专家咨询确定了影响第三阶段管理的20个因素.
- 集成的DAG包括35个共变量和339个定向边,产生了四个最小的足够调整集.
结论:
- 集成的DAG和最小足够的调整集是研究设计和分析的宝贵工具.
- 这些工具有助于最大限度地减少在估计生理第三阶段护理与催产素预防对PPH的因果关系方面的偏差.
- 这种方法暴露了关于因果关系的潜在假设.
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