Effects of transcutaneous spinal direct current stimulation in idiopathic restless legs patients.

Abstract:

BACKGROUND:Transcutaneous spinal direct current stimulation (tsDCS) is a new non-invasive technique to modulate spinal cord activity. The pathophysiological concept of primary RLS proposes increased spinal excitability. OBJECTIVE:This pilot study used tsDCS to reduce pathologically enhanced spinal excitability in RLS patients and to thereby ameliorate clinical symptoms. METHODS:20 patients with idiopathic RLS and 14 healthy subjects participated in this double-blinded, placebo-controlled study. All participants received one session of cathodal, anodal and sham stimulation of the thoracic spinal cord for 15 min (2.5 mA) each, in randomized order during their symptomatic phase in the evening. The soleus Hoffmann-reflex with Hmax/Mmax-ratio and seven different H2/H1-ratios (of two H-reflex responses to double stimuli) were measured. The RLS symptoms were assessed by a visual analogue scale (VAS). All parameters were measured before and twice after tsDCS. RESULTS:RLS patients showed increased H2/H1-ratios during their symptomatic phase in the evening. Application of anodal stimulation led to a decreased H2/H1-ratio for 0.2 and 0.3 s interstimulus intervals in patients. Furthermore, application of anodal and cathodal stimulation led to a reduction in restless legs symptoms on the VAS, whereas application of sham stimulation had no effects on either the VAS or on the H2/H1-ratio in patients. VAS changes did not correlate with changes of H2/H1-ratios. CONCLUSIONS:This is the first tsDCS study in idiopathic RLS, which resulted in short-lasting clinical improvement. Furthermore, our results support the pathophysiological concept of spinal cord hyperexcitability in primary RLS and provide the basis for a new non-pharmacological treatment tool.

journal_name

Brain Stimul

journal_title

Brain stimulation

authors

Heide AC,Winkler T,Helms HJ,Nitsche MA,Trenkwalder C,Paulus W,Bachmann CG

doi

10.1016/j.brs.2014.06.008

subject

Has Abstract

pub_date

2014-09-01 00:00:00

pages

636-42

issue

5

eissn

1935-861X

issn

1876-4754

pii

S1935-861X(14)00188-0

journal_volume

7

pub_type

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