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b超中ri值多少算正常范围
更新时间: 2020-11-04 00:00:00  

不同部位血管ri正常值是不同的,如肾动脉血管ri值多小于0.8,超过0.8多提示动脉硬化。颈动脉血管ri值0.5-0.75,超过0.75多提示外周血管阻力增加,常见于颅内压增高、血管阻塞、脑动脉硬化等。ri是血流阻力指数的缩写,反应血管阻力状况的指标,ri=收缩血流速度-舒张末期血流速度/收缩峰血流速度。

关键词: ri 多少 正常 范围

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