Background and Purposes
Repetitive transcranial magnetic stimulation (rTMS) has been examined as a potential treatment for many neurological disorders. High-frequency rTMS in particular improves cognitive functions such as verbal fluency and memory. I...
Background and Purposes
Repetitive transcranial magnetic stimulation (rTMS) has been examined as a potential treatment for many neurological disorders. High-frequency rTMS in particular improves cognitive functions such as verbal fluency and memory. In the previous study, we reported that rTMS combined with cognitive training (rTMS-CT) showed cognitive improvement with Alzheimer’s disease (AD), especially, in the mild stage of the disease. We analyzed the effect of initial and booster rTMS-CT in patients with AD.
Methods
A prospective, randomized, double-blind, placebo-controlled study was performed with 28 AD patients (21 patients and 7 patients in the treatment and sham groups, respectively. After 2 years, eight of the 28 patients engaged themselves in retreating the rTMS-CT. The rTMS protocols were configured for six cortical areas (both dorsolateral prefrontal and parietal somatosensory associated cortices and Broca’s and Wernicke’s areas; 10 Hz, 90–110% intensity, and 5 days/week for 6 weeks). Neuropsychological assessments were performed using the AD Assessment Scale-cognitive subscale (ADAS-cog), MMSE, clinical dementia rating (CDR), and geriatric depression scale (GDS) in the baseline, just after the rTMS-CT and 6 weeks after the second evaluation.
Results
There was no significant interactive effect of time between the groups at first treatment, although the ADAS-cog scores in the treatment group (from 23.3 at baseline to 17.9 at the end of the study) was much more improved than sham group (from 23.7 at baseline to 21.4 at the end of the study). There was significant improvement of the ADAS-cog score after the rTMS-CT treatment compared with that of the baseline ADAS-cog score in the treatment group (p=0.001). The patients who treated with rTMS-CT showed lesser cognitive decline than who belonged to the sham group (p=0.045) when 8 patients engaged in retreatment with rTMS-CT after 2 years. At the booster treatment with rTMS-CT, the 8 patients showed significant improvement compared to the baseline score (ADAS-cog changed from 25.0 to 22.8, p=0.041).
Conclusions
rTMS-CT shows significant effect on cognitive function in AD, so rTMS-CT might be useful adjuvant therapy of cholinesterase inhibitors in AD. Cognitive function in the rTMS-CT treated group retains in 2 years, so booster rTMS-CT treatment might be useful to maintain cognitive function in AD though the treatment interval has not been determined.