尿酸控制在多少才算达标呢?“56789”口诀告诉你!

2017-08-30 省人民风湿科俞烜华医师 医学之声

有资料表明,目前高尿酸血症人群已高达1.2亿,高尿酸血症是痛风的最主要元凶。正常人的血尿酸值男性约为210-420umol/L,女性约为150-360umol/L(每家医院尿酸正常参考范围还略有不同)。

男性痛风发病率远高于女性,女性绝经后因为雌激素水平下降(雌激素可以促进尿酸排泄),其血尿酸值在绝经期后接近男性,痛风发病率也明显升高。大多数痛风患者都有肾脏受累,尤其是慢性痛风患者,严重者可出现关节破坏畸形、肾功能损害甚至尿毒症,痛风患者常伴发高脂血症、高血压糖尿病、动脉硬化及冠心病等,严重危害患者生活质量。

那么,对于无痛风症状的单纯高尿酸血症患者,何时应该降尿酸?缓解期有无痛风石的痛风患者,尿酸控制在多少才算达标呢?降尿酸是否单纯管住嘴?尿酸是否降得越低越好?降尿酸药物何时可以停药?

针对如上具体临床问题,结合高尿酸血症、痛风指南进行总结,笔者归纳出“


5(300 μmol/L)的含义

首选,我来谈谈5的含义:即有痛风石的痛风患者,建议把血尿酸降到 300 μmol/L 以下。

理由是:有研究表明,在降尿酸治疗中,血尿酸水平降得越低,痛风石溶解越快。此外,建议合并痛风肾脏损害患者也应以300 μmol/L 为最终降尿酸治疗目标值,理由是:控制痛风原发病,降低血尿酸可减少尿酸盐结晶沉积肾脏,保护肾功能。

6(360 μmol/L)的含义
那么,6的含义呢?指南推荐:没有痛风石的痛风患者,建议把血尿酸值降到 360 μmol/L 以下。

在门诊,经常有痛风患者会问,既然血尿酸的正常参考值上限是 420 μmol/L,为什么不是控制到正常值420 μmol/L 就可以了,而是要在 360 μmol/L 以下呢?

因为血尿酸降至 420 μmol/L 左右时,仅能减慢尿酸盐晶体持续沉积的速度,不能逆转病程。把血尿酸控制在 360 μmol/L以下,就可以保持血尿酸在尿酸盐晶体的溶解度以下,促使已经存在或可能存在的尿酸盐晶体溶解。因此,对于没有痛风石的痛风患者,应以360 μmol/L为降尿酸的治疗目标。

7(420 μmol/L)的含义
再来说说7的含义,鉴于性别差异,指南与教科书常将高尿酸血症的分开定义,将男性的阈值定为420umol/L,女性则为360umol/L。

有专家认为应用两个标准不仅会引起尿酸值在360-420umol/L这一灰色地带的患者诊断不明确,还会造成许多不必要的争议。

因此,有专家建议将高尿酸的定义统一于420umol/L,即正常饮食情况下,非同日两次检测,不分性别、年龄,血尿酸水平超过420umol/L,即为高尿酸血症。

8(480 μmol/L)的含义

高尿酸血症虽然是痛风的最主要元凶,那么是不是所有高尿酸血症患者都需要接受降尿酸药物治疗呢?这是临床工作中常常会碰到的一个问题,因此下面提提8的含义。

根据诸多研究结果,指南推荐高尿酸血症者若合并心脑血管疾病,建议血尿酸超过480μmol/L,除了饮食控制外,需要降尿酸药物干预治疗。

9(540 μmol/L)的含义
那么问题又来了,未合并心脑血管疾病的高尿酸血症患者,即无任何症状的高尿酸血症,血尿酸超过多少要降尿酸药物干预呢?

同样根据诸多研究结果:
无任何症状的高尿酸血症,指南推荐血尿酸超过540μmol/L,即需降尿酸药物干预治疗。

20%的含义
既然痛风是代谢性疾病,那就是吃出来的,很多痛风患者都认为降尿酸管住嘴就可以了,不需要吃药,药物副作用大等等,甚至有的痛风患者过着“和尚”的日子,这是错误的观点。

科学研究表明,忌口并不是痛风治疗的全部。严格管住嘴通常也只能使尿酸降低20%左右,是不太可能单纯通过忌口就把尿酸降到目标值的。
所以除了忌口还要遵医嘱服用降尿酸药物(别嘌醇、非布司他、苯溴马隆等)、控制体重等。

3(180 μmol/L)的含义
很多痛风患者会认为既然高尿酸对身体危害如此大,那尿酸就应该降得越低越好。事实并非如此,尿酸并不是降得越低越好。

全世界大规模的流行病学研究发现,尿酸与大脑组织的退行性病变有关。尿酸低于正常值,就可能引起老年性痴呆和多发性硬化症等疾病。研究人员用五年,对英国的59204名痛风患者和238805名非痛风患者做了比较,这组人的平均年龄为65岁,他们的情况相似。

研究发现,痛风患者中有309个老年痴呆症病例,非痛风患者当中有1942个病例。痛风患者得老年痴呆症的比例比另一组低24%。

其原因可能是尿酸能防止氧化应激。它可能有助于延缓神经老化。此外,还有研究表明,尿酸具有维持血压功效,尿酸过低会增加心血管疾病、老年痴呆的风险。

我们在重视高尿酸危害的同时不能忽视其有益的方面,总之,适则有利,过则有弊,痛风患者降尿酸治疗一般血尿酸水平不低于180umol/L为宜。

8X-降尿酸的药要吃多久?
如上所述,既然部分高尿酸血症、痛风患者需降尿酸治疗,那么降尿酸的药要吃多久,可能目前没人可以确切回答这个问题。
门诊痛风患者经常会问这个问题,医生一般会回答“药需要长期吃一段时间”。

其实,医生也不知道对于每个人的“长期一段时间”到底是多久。大家需要认识到:痛风与高血压糖尿病这些疾病都是慢性病,高血压有降压目标,糖尿病有降糖目标,痛风也有降尿酸目标。

以前教科书告诉我们,降尿酸治疗一旦开始,就需要终身维持,把血尿酸水平控制在达标水平。

笔者个人临床经验认为如果血尿酸水平维持300(有痛风石)或360umol/L(无痛风石)以下超过数月甚至数年,体内沉积的痛风石逐步溶解消失,就不再发作了(就像乌龙山的土匪经过长期的剿匪已经全部剿灭了)。

部分患者通过自身调节可以维持尿酸水平长期达标,甚至可以停药,以后只要控制好饮食,痛风就不会复发了,这就算是临床治愈了,这也就是目前认为痛风是一种可治愈的风湿病的含义。

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    2017-09-15 139****5926

    好好文章学习了

    0

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    2017-08-31 1e183db5m33(暂无匿称)

    实用学习了.

    0

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    2017-08-31 yfjms

    学习了

    0

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    2017-08-30 惠映实验室

    学习了.谢谢.

    0

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    2017-08-30 惠映实验室

    学习了.谢谢.

    0

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    2017-08-30 139****5926

    好好文章学习了

    0

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