Restless legs syndrome: Clinical changes in nervous system excitability at the spinal cord level.

Abstract:

:Restless legs syndrome (RLS) is a complex multifactorial disorder whose aetiology has yet to be fully elucidated. Some of the features of RLS, such as processing of sensations and activation of movement, may result from a dysfunction in spinal processing giving rise to a state of spinal hyperexcitability. In the current article we review studies investigating spinal excitability in RLS patients looking specifically at electrophysiological studies of spinal activity, sensory evaluations, and spinal reflex studies. Increased spinal excitability has been shown in RLS patients based on the combined data from electrophysiological studies. Results from studies assessing sensory evaluations in RLS patients show enhanced spinal processing of nociceptive inputs possibly due to central sensitisation. However, not all sensory modalities demonstrate an increase in sensitivity. An increase in nervous system excitability would result in an increase in reflex responses in RLS patients however the data from reflex analyses in RLS patients has failed to consistently show this expected result. Overall changes to RLS spinal excitability have been demonstrated though these changes might be heterogeneous as not all afferent input appears to be affected in the same manner. There may be phase-dependent and modality-dependent alterations in spinal excitability suggesting that the theory of absolute spinal hyperexcitability in RLS patients' needs to be reconsidered.

journal_name

Sleep Med Rev

journal_title

Sleep medicine reviews

authors

Dafkin C,McKinon W,Kerr S

doi

10.1016/j.smrv.2019.05.005

subject

Has Abstract

pub_date

2019-10-01 00:00:00

pages

9-17

eissn

1087-0792

issn

1532-2955

pii

S1087-0792(19)30040-1

journal_volume

47

pub_type

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