Altered response to rTMS in patients with Alzheimer's disease

M. Inghilleri, A. Conte, V. Frasca, N. Scaldaferri, F. Gilio, M. Santini, G. Fabbrini, M. Prencipe, A. Berardelli

Research output: Contribution to journalArticlepeer-review

Abstract

Objective: In this study, we tested the excitability of cortical motor areas in patients with Alzheimer's disease. Because repetitive transcranial magnetic stimulation (rTMS) modulates cortical excitability, possibly by inducing a short-term increase in synaptic efficacy, we used rTMS to investigate motor cortex excitability in patients with Alzheimer's disease. Methods: We tested the changes in the size and threshold of motor evoked potential (MEP) and cortical silent period (CSP) duration evoked by focal rTMS delivered in 10 trains of 10 stimuli at 5 Hz frequency and 120% rMth intensity in a group of patients with Alzheimer's disease, and age-matched controls. In a further session, rTMS was also delivered at 1 Hz frequency (trains of 10 stimuli, 120% rMth). Results: Whereas in control subjects, 5 Hz-rTMS elicited normal MEPs that progressively increased in size during the train, in patients, it elicited MEPs that decreased in size. The increase in the duration of the CSP was similar in patients and healthy controls. One hertz rTMS left the MEP amplitude unchanged in patients and healthy controls. Conclusions: The lack of MEP facilitation reflects an altered response to 5 Hz-rTMS in patients with Alzheimer's disease. Significance: Our rTMS findings strongly suggest an altered cortical plasticity in excitatory circuits within motor cortex in patients with Alzheimer's disease.

Original languageEnglish
Pages (from-to)103-109
Number of pages7
JournalClinical Neurophysiology
Volume117
Issue number1
DOIs
Publication statusPublished - Jan 2006

Keywords

  • Alzheimer's disease
  • Cortical excitability
  • MEP
  • Repetitive magnetic stimulation
  • Synaptic efficacy
  • Transcranial stimulation

ASJC Scopus subject areas

  • Clinical Neurology
  • Radiology Nuclear Medicine and imaging
  • Neurology
  • Sensory Systems
  • Physiology (medical)

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