Neurology:杜氏肌营养不良症患者肘关节屈肌 MRI 脂肪分数与手口运动丧失的关系

2021-10-01 Naomii MedSci原创

近日有研究人员对定量磁共振成像(QMRI)脂肪分数(FF)作为非动态Duchenne肌营养不良(DMD)患者生物标志物的潜力进行了探讨,还评估了肘屈肌FF对年龄的加性预测价值。

     Duchenne肌营养不良症(DMD)的特征是近端到远端的肌肉无力,其独立行走能力的丧失早在失去手部活动能力(从手到嘴)数年之前即青少年早期。虽然治疗动态DMD的首批药物已经获得有条件的批准,但由于渐进性的肌肉被脂肪、纤维化取代,这一过程是不可逆的,导致靶组织减少,尚不能对疾病后期阶段进行推论。DMD的临床试验具有挑战性,可以通过分层或作为替代终点的客观生物标记物来促进DMD的临床试验。股外侧肌的定量磁共振成像(QMRI)脂肪分数(FF)已被证明可以预测DMD行走能力的丧失。重要的是,这一预测值基于年龄,因为任何随时间持续变化的参数都会与进展性疾病的功能下降相关。上臂QMRI FF随时间增加,并与功能改变呈横断面相关。

      近日,有研究人员对定量磁共振成像(QMRI)脂肪分数(FF)作为非动态Duchenne肌营养不良(DMD)患者生物标志物的潜力进行了探讨,还评估了肘屈肌FF对年龄的加性预测价值。

      纳入非动态DMD患者(≥为8岁)。分别于基线及随访12、18、24个月行右上臂4点Dixon MRI扫描。肘屈肌Ff取自5个中央层面。在每4个月的研究访问和电话中确定手对嘴运动的活动能力。使用具有随机斜率的混合模型将FF拟合成S形曲线,以预测个体轨迹。用预测的FF作为时变协变量,根据Cox模型计算肘屈肌FF对年龄的增加预测值,得出危险比(Risk Ratio)。

纳入20例DMD患者的48个磁共振成像。

  • 肘屈肌FF增加一个百分点对失去手对嘴活动的时间的危险比为1.12%(95%-置信区间为1.04-1.21;p=0.002)。这相当于在任何年龄段肘屈肌FF高10个百分点的患者中,失去手对嘴活动的瞬时风险增加3.13倍。

     在这项前瞻性研究中,肘屈肌FF预测与年龄无关的手对嘴运动的丧失。QMRI测量的屈肘FF可作为非动态DMD患者临床试验的替代终点或分层工具。

文献来源:https://n.neurology.org/content/early/2021/09/07/WNL.0000000000012724.long

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    2022-06-30 xugc
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    2022-04-10 yinhl1978
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    2021-10-01 13f0c37dm61暂无昵称

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在最近的一项研究中,来自斯坦福大学医学院的研究人员描述了一种在DMD的mdx模型中无创评估疾病进展的新方法。

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研究证实,Eteplirsen长期治疗可诱导肌细胞穿透、外显子跳跃并促进新的肌萎缩蛋白表达