Cortical excitability in patients with essential tremor

Stefano Romeo, Alfredo Berardelli, Francesca Pedace, Maurizio Inghilleri, Morena Giovannelli, Mario Manfredi

Research output: Contribution to journalArticlepeer-review

Abstract

We used transcranial magnetic stimulation in 10 patients with essential tremor and 8 matched healthy subjects. A round stimulating coil was placed over the vertex and electromyographic activity was recorded from the first dorsal interosseous muscle. Paired transcranial stimuli were delivered at interstimulus intervals of 3, 5, 20, 100, 150, and 200 ms. The intensity of the conditioning stimulus was 80% of motor threshold at short and 150% at long interstimulus intervals (ISIs). We also measured the silent period obtained after a single magnetic pulse delivered at 150% of motor threshold during a submaximal muscle contraction. Patients and controls had similar motor threshold and similar latencies. Paired magnetic stimuli given at short and long ISIs at rest, and during a voluntary muscle contraction, elicited similar responses in both groups. The silent period evoked by transcranial magnetic stimulation had a similar duration in patients with ET and controls. In conclusion, these findings suggest that patients with essential tremor have normal cortical motor area excitability.

Original languageEnglish
Pages (from-to)1304-1308
Number of pages5
JournalMuscle and Nerve
Volume21
Issue number10
DOIs
Publication statusPublished - 1998

Keywords

  • Essential tremor
  • Magnetic stimulation
  • Motor cortex

ASJC Scopus subject areas

  • Clinical Neurology
  • Neuroscience(all)

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