甲状腺激素水平高,增加心源性猝死风险!

2016-10-08 岚逸筠篁 医学界内分泌频道

对于甲亢患者来说,由于血液中高浓度甲状腺激素能增强心肌细胞对儿茶酚胺的敏感性,从而使心肌收缩力增强、耗能增加。由于心脏长期处于高负荷状态,导致心脏增大、心律失常、心力衰竭,甚至有心源性猝死(SCD)的危险。其实,这种临床现象被称为“甲亢心”,目前已经被认识并重视。但是对于甲状腺激素浓度在正常区间的人来说,他们SCD的风险会不会随着甲状腺激素的水平有所变呢?近期,国际心血管权威杂志《Circulat

对于甲亢患者来说,由于血液中高浓度甲状腺激素能增强心肌细胞对儿茶酚胺的敏感性,从而使心肌收缩力增强、耗能增加。由于心脏长期处于高负荷状态,导致心脏增大、心律失常、心力衰竭,甚至有心源性猝死(SCD)的危险。


其实,这种临床现象被称为“甲亢心”,目前已经被认识并重视。但是对于甲状腺激素浓度在正常区间的人来说,他们SCD的风险会不会随着甲状腺激素的水平有所变呢?近期,国际心血管权威杂志《Circulation》上的一项研究揭示了答案。


甲状腺激素水平与SCD风险正相关


荷兰伊拉斯谟大学鹿特丹医学中心的研究团队对荷兰中老年心血管疾病及其他慢性病患者进行了长达9年的调查和分析。



(图1:10000多名患者的基线资料)


结果发现,促甲状腺激素(TSH)越低、游离甲状腺激素(FT4)越高,SCD事件发生数越高(图2)。



(图2)


但是SCD和许多因素有关,比如高脂血症、高血压、肥胖、糖尿病等等,如果去除这些因素影响呢?统计学结果证实还是如此(图3)。



(图3)


而且在人群中,FT4水平在正常高限者10年内发生SCD风险为4%,比在正常低限者的风险(1%)高3倍左右(图4)。


(图4)


该项研究的第一作者Layal Chaker博士在接受采访时说,FT4水平可能有助于评估SCD风险并做积极预防;此外,临床实践中要避免对甲状腺激素替代治疗者进行过度治疗。不过,由于人种的限制,需要更进一步的深入研究以验证该结果。

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    2016-10-11 知难而进

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    2016-10-11 知难而进

    谢谢分享!

    0

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    2016-10-10 mhm295

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