N-acetylaspartate concentration in psychotic disorders: T2-relaxation effects.

N-acetylaspartate concentration in psychotic disorders: T2-relaxation effects.
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精神障碍患者的N-乙酰天冬氨酸浓度:T2舒张效应。

DOI:
10.1016/j.schres.2021.04.012
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发表时间:
2021-06
影响因子:
4.5
通讯作者:
Ongur D
Ongur D
中科院分区:
医学2区
文献类型:
--
作者:
Kuan E;Chen X;Du F;Ongur D

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我们使用质子磁共振波谱(1H MRS)来量化N-乙酰天冬氨酸(NAA)浓度和表观自旋-自旋(T2)弛豫时间,其中还包括扩散衰减,在首次发病和慢性精神病患者与匹配的健康对照组相比。104名诊断为精神障碍的患者和50名匹配的对照者在4特斯拉下进行扫描。使用PRESS在四个回波时间(TE=30、90、150和200 ms)收集1H MRS数据。计算了NAA相对于水的浓度以及NAA和水的表观T2弛豫时间。在TE=30 ms时,与年龄匹配的健康对照组相比,慢性精神病患者中未进行T2校正的NAA浓度显著较低(分别为P=0.013,N=61和26),但与匹配的对照组相比,首次发作患者中的NAA浓度正常(分别为N=43和24)。T2校正后,组间无显著差异。虽然扩散衰减没有独立占,这些研究结果表明,T2弛豫作出了重大影响NAA浓度的措施,精神障碍。因此,它可能是神经元微环境指标的NAA和水T2弛豫时间,而不是神经元的完整性指标的NAA浓度的基础广泛报道的NAA浓度降低精神障碍。
We used proton magnetic resonance spectroscopy (1H MRS) to quantify N-acetylaspartate (NAA) concentrations and apparent spin-spin (T2) relaxation times, which also include diffusion attenuations, in first episode and chronic psychosis patients compared to matched healthy controls. 104 patients diagnosed with psychotic disorders and 50 matched controls were scanned at 4 Tesla. 1H MRS data were collected at four echo times (TE=30, 90, 150 and 200 ms) using PRESS. NAA concentrations referenced to water and apparent T2 relaxation times of NAA and water were calculated. At TE=30 ms, NAA concentration without T2 correction was significantly lower in chronic psychosis patients compared to age-matched healthy controls (p=0.013, N=61 and 26, respectively) but normal in first episode patients compared to matched controls (N=43 and 24, respectively). After T2 correction, no significant differences remained between the groups. While diffusion attenuation was not independently accounted for, these findings indicate that T2 relaxation makes a major impact on NAA concentration measures in psychotic disorders. Thus, it may be neuronal microenvironment indexed by NAA and water T2 relaxation times and not neuronal integrity indexed by NAA concentration that underlies the widely reported NAA concentration reductions in psychotic disorders.
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