目的 探讨磁共振扩散张量成像(DTI)技术在巨细胞病毒感染(CMV)所致感音性耳聋(SNHL)患儿听觉通路中的应用价值.方法 选取CMV感染所致SNHL的患儿31例,其中双侧听力受损(BPHL)组13例、单侧听力受损(UPHL)组18例[分为听力受损侧(lpsi亚组)和未受损侧(con亚组)];无听力损伤的患儿36例(对照组).采用DTI技术获得各组双侧下丘和外侧丘系各向异性分数(FA)、平均扩散率(MD)、轴向扩散率(AD)、径向扩散率(RD),并进行统计学分析.结果 与对照组相比,BPHL组双侧下丘、外侧丘系FA值减低、RD值增高(P均＜0.001).与con亚组相比,lpsi亚组FA值减低、RD值增高(P均＜0.001).与对照组比较,lpsi亚组双侧下丘和外侧丘系的FA值减低,双侧下丘RD值增高(P均＜0.001);与con亚组比较,BPHL组外侧丘系的FA值减低、RD值增高,且双侧下丘的RD值增高(P均＜0.001).双侧下丘FA值与听觉阈值呈负相关(r=-0.966,P＜0.001).IC和LL区的MD和AD值差异均无统计学意义(P均＞0.05).结论 CMV感染所致SNHL患儿的听觉通路脑白质发生了明显改变,提示脑白质髓鞘脱失或髓鞘发育不良.%Objective To investigate the application value of magnetic resonance diffusion tensor imaging (DTI) in auditory pathway of sensorineural hearing loss (SNHL) infants caused by cytomegalovirus (CMV) infection.Methods Thirtyone SNHL infants caused by CMV infections were included,and were divided into bilateral hearing loss (BPHL;n=13) group and unilateral hearing impairment (UPHL;n=18) group (including damaged side [lpsi subgroup] and the undamaged side [contrast subgroup]).Thirty-one infants without hearing loss as control group.The fractional anisotropy (FA),the mean diffusivity (MD),the axial diffusivity (AD) and the radial diffusivity (RD) of bilateral inferior colliculus (IC)and lateral lemniscus (LL) were obtained with DTI technique.The statistical analysis was performed.Results Compared with the control group,the FA value reduced and the RD value increased at LL and IC in the BPHL group (all P＜0.001).Compared with the contrast subgroup,the FA value reduced and the RD value increased at IC and LL in lpsi subgroup (all P＜0.001).Compared with the control group,the FA value reduced at LL in the lpsi subgroup,and FA values reduced and RD value increased at IC (all P＜0.001).Compared with the contrast subgroup,the FA value reduced and RD value increased at LL,and RD value increased at IC in the BPHL group (all P＜0.001).The FA value at IC was negatively correlated with auditory threshold (r=-0.966,P＜0.001).No matter in IC or in LL,the MD and AD had no statistical differences (all P＞0.05).Conclusion White matter of auditory pathway of SNHL infant caused by CMV infection is obviously altered,suggesting white matter myelination or myelin dysplasia.
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