老年人急性心肌梗塞的更强化治疗是否会降低死亡率? 使用仪表变量进行分析
M McClellan1, B J McNeil, J P Newhouse
1Department of Health Care Policy, Harvard Medical School, Boston, MA.
JAMA
|September 21, 1994
概括
对于患有急性心肌梗塞 (AMI) 的老年患者来说,在前24小时内的重症监护显著影响了生存率. 侵袭性手术为边缘患者提供了最小的长期生存益处.
科学领域:
- 心脏病学 心脏病学
- 老年医学 老年医学
- 医疗保健服务研究 医疗服务研究
背景情况:
- 患有急性心肌梗塞 (AMI) 的老年患者往往有复杂的健康需求.
- 由于未观察到的患者特征 (选择偏差),估计密集治疗对死亡率的真正影响具有挑战性.
研究的目的:
- 确定密集治疗对经历AMI的老年患者长期死亡率的影响.
- 为了解决AMI治疗效果的观察性研究中的选择偏差.
主要方法:
- 使用了1987-1991年的Medicare索赔数据进行观察性分析.
- 使用医院的差距作为仪器变量来近似随机化.
- 在AMI后4年的估计存活率.
主要成果:
- 不同的医院距离强烈预测治疗强度,独立于患者的健康状况.
- 侵袭性手术的渐进使用显示,死亡率的边际益处最多为5个百分点,主要是在第一天内.
- 高医院AMI体积对4年死亡率的影响很小 (<1%),也发生在第1天.
- 农村患者的急性死亡率增加了0.6%,即使考虑到获得治疗的机会.
结论:
- 在24小时内获得早期医院护理对于老年AMI患者的长期生存至关重要.
- 对于边缘患者来说,通过增加使用导管和再血管程序增加的生存率似乎是最小的.
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