High-Definition Transcranial Direct Current Stimulation Improves Delayed Memory in Alzheimer's Disease Patients: A Pilot Study Using Computational Modeling to Optimize Electrode Position

被引:27
作者
Rasmussen, Ingrid Daae [1 ,2 ]
Boayue, Nya Mehnwolo [1 ]
Mittner, Matthias [1 ]
Bystad, Martin [1 ,2 ]
Gronli, Ole K. [2 ]
Vangberg, Torgil Riise [3 ,4 ]
Csifcsak, Gabor [1 ]
Aslaksen, Per M. [1 ,5 ]
机构
[1] UiT Art Univ Norway, Fac Hlth Sci, Dept Psychol, Res Grp Cognit Neurosci, Tromso, Norway
[2] Univ Hosp North Norway, Dept Geropsychiat, Tromso, Norway
[3] Univ Hosp North Norway, Dept Clin Med, Tromso, Norway
[4] Univ Hosp North Norway, PET Ctr, Tromso, Norway
[5] Univ Hosp North Norway, Dept Child & Adolescent Psychiat, Tromso, Norway
关键词
Alzheimer's disease; computational modeling; NIBS; noninvasive brain stimulation; tDCS; transcranial direct current stimulation; MILD COGNITIVE IMPAIRMENT; MINI-MENTAL-STATE; NEUROPSYCHOLOGICAL STATUS; REPEATABLE BATTERY; PERMUTATION INFERENCE; EPISODIC MEMORY; BRAIN ATROPHY; ENHANCEMENT; TDCS; MRI;
D O I
10.3233/JAD-210378
中图分类号
Q189 [神经科学];
学科分类号
071006 [神经生物学];
摘要
Background: The optimal stimulation parameters when using transcranial direct current stimulation (tDCS) to improve memory performance in patients with Alzheimer's disease (AD) are lacking. In healthy individuals, inter-individual differences in brain anatomy significantly influence current distribution during tDCS, an effect that might be aggravated by variations in cortical atrophy in AD patients. Objective: To measure the effect of individualized HD-tDCS in AD patients. Methods: Nineteen AD patients were randomly assigned to receive active or sham high-definition tDCS (HD-tDCS). Computational modeling of the HD-tDCS-induced electric field in each patient's brain was analyzed based on magnetic resonance imaging (MRI) scans. The chosen montage provided the highest net anodal electric field in the left dorsolateral prefrontal cortex (DLPFC). An accelerated HD-tDCS design was conducted (2mA for 3x20 min) on two separate days. Pre- and post-intervention cognitive tests and T1 and T2-weighted MRI and diffusion tensor imaging data at baseline were analyzed. Results: Different montages were optimal for individual patients. The active HD-tDCS group improved significantly in delayed memory andMMSEperformance compared to the sham group. Five participants in the active group had higher scores on delayed memory post HD-tDCS, four remained stable and one declined. The active HD-tDCS group had a significant positive correlation between fractional anisotropy in the anterior thalamic radiation and delayed memory score. Conclusion: HD-tDCS significantly improved delayed memory in AD. Our study can be regarded as a proof-of-concept attempt to increase tDCS efficacy. The present findings should be confirmed in larger samples.
引用
收藏
页码:753 / 769
页数:17
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