Biomed Pap Med Fac Univ Palacky Olomouc Czech Repub. 2015, 159(2):327-332 | DOI: 10.5507/bp.2013.081

Cutaneous silent periods in multiple system atrophy

Ivana Stetkarovaa,b#, Markus Koflerc#, Veronika Majerovad
a Department of Neurology, Third Faculty of Medicine, Charles University in Prague, Prague, Czech Republic
b Department of Neurology, Na Homolce Hospital, Prague
c Department of Neurology, Hochzirl Hospital, Zirl, Austria
d Department of Neurology and Center of Clinical Neuroscience, 1st Faculty of Medicine, Charles University in Prague and General University Hospital in Prague, Prague

Aim: The cutaneous silent period (CSP) is a spinal inhibitory reflex primarily mediated by A-delta fibers. Prolonged CSPs have been reported in patients with restless legs syndrome (RLS) and idiopathic Parkinson's disease (IPD). Dopaminergic medication normalizes the CSP, concurring with the effect of levodopa on CSPs. To date, CSPs have not been extensively studied in patients with multiple system atrophy (MSA). The purpose of this study was to confirm abnormal CSP findings in a group of MSA patients and to affirm the lack of influence of levodopa on CSPs during long-term treatment.

Methods: We investigated 15 patients (4 males, 11 females, age 58-71 years) who fulfilled the diagnostic criteria for possible MSA. Thirteen patients had predominant parkinsonian symptoms (MSA-P), 2 had predominant cerebellar signs (MSA-C). We recorded CSPs in thenar muscles following noxious digit II stimulation. Sixteen healthy volunteers (6 males, 10 females, range 24-56 years) served as control subjects for CSP recordings.

Results: Group average CSP onset was mildly delayed (P<0.01), whereas CSP end latency (P<0.001) were markedly delayed and CSP duration prolonged (P<0.001) in MSA patients compared to healthy controls. MSA patients on levodopa treatment did not differ in their CSPs from those without levodopa. The dose of levodopa did not correlate to any CSP parameter.

Conclusion: The observed CSP prolongation corroborates previous findings in a limited number of MSA patients. The ineffectiveness of long-term levodopa on CSP abnormalities is consistent with its poor clinical effect in MSA.

Keywords: multiple system atrophy, atypical parkinsonism, spinal reflex, cutaneous silent period, levodopa

Received: May 2, 2013; Accepted: October 15, 2013; Prepublished online: November 12, 2013; Published: June 28, 2015  Show citation

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Stetkarova, I., Kofler, M., & Majerova, V. (2015). Cutaneous silent periods in multiple system atrophy. Biomedical papers159(2), 327-332. doi: 10.5507/bp.2013.081
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