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血脑屏障通透性指数可预测血肿扩大

2013-10-14 佚名 健康报

首都医科大学附属北京天坛医院神经内科赵性泉教授带领硕士研究生、北大国际医院神经内科医师王玮婧新近完成的一项研究显示,脑出血早期血肿扩大对脑出血预后有重要影响,血脑屏障通透性指数对脑出血早期血肿扩大具有预测作用,其灵敏度和特异性均较高。 脑出血是最严重的脑血管疾病之一,其发病率约占所有脑血管疾病的近两成。现已知,血肿扩大是脑出血预后不良的独立危险因素,但如何快速准确地

首都医科大学附属北京天坛医院神经内科赵性泉教授带领硕士研究生、北大国际医院神经内科医师王玮婧新近完成的一项研究显示,脑出血早期血肿扩大对脑出血预后有重要影响,血脑屏障通透性指数对脑出血早期血肿扩大具有预测作用,其灵敏度和特异性均较高。

脑出血是最严重的脑血管疾病之一,其发病率约占所有脑血管疾病的近两成。现已知,血肿扩大是脑出血预后不良的独立危险因素,但如何快速准确地预测血肿扩大一直是临床研究的难题。过去判断血肿是否扩大主要看强化后的影像血管造影剂是否外渗来定性,此方法多依赖医师的经验判断,而实际应用差异性很大,极易误诊。

赵性泉等选取北京天坛医院近5年接诊的40名发病在6个小时以内的急性脑出血患者作为研究对象,入院时以及在发病24小时时均行颅脑CT检查,确定出血部位,计算对比两次检查的出血量。凡是此时出血量较入院时增加33%以上的视为血肿扩大,并依此分为血肿扩大组和血肿未扩大组。通过计算机断层扫描血管成像,比较入院及发病24小时计算机断层扫描(CT)的血肿体积、测量血肿周围、水肿周围和远隔区域组织的血脑屏障通透性,以此来预测血肿扩大的灵敏度及特异度。

研究结果显示,血肿扩大的发生率为45%,血肿扩大组血肿周围组织血脑屏障通透性指数明显高于未扩大组;血肿周围水肿组织通透性指数越大的患者,其发生血肿扩大的可能性亦越高;血脑屏障通透性指数诊断血肿扩大的预测灵敏度为88.89%,特异度为68.18%。

赵性泉介绍,血脑屏障通透性指数是指患者患侧通透性面积与健侧通透性面积的比值,此方法能够消除患者个体差异的影响,其计算血肿体积较以往研究更加准确。

此研究首次将血脑屏障通透性指数应用于预测脑出血血肿扩大,为临床早发现、早干预及改善患者预后提供了一种较为简便的量化指标。

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    2014-05-02 zhmscau
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