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May 27, 2014; 82 (21) Article

Peripheral hypoxia in restless legs syndrome (Willis-Ekbom disease)

Aaro V. Salminen, Ville Rimpilä, Olli Polo
First published April 30, 2014, DOI: https://doi.org/10.1212/WNL.0000000000000454
Aaro V. Salminen
From the University of Tampere (A.V.S., V.R., O.P.), School of Medicine; Unesta Research Centre (A.V.S., V.R., O.P.), Tampere; and Department of Respiratory Medicine (O.P.), Tampere University Hospital, Finland.
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Ville Rimpilä
From the University of Tampere (A.V.S., V.R., O.P.), School of Medicine; Unesta Research Centre (A.V.S., V.R., O.P.), Tampere; and Department of Respiratory Medicine (O.P.), Tampere University Hospital, Finland.
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Olli Polo
From the University of Tampere (A.V.S., V.R., O.P.), School of Medicine; Unesta Research Centre (A.V.S., V.R., O.P.), Tampere; and Department of Respiratory Medicine (O.P.), Tampere University Hospital, Finland.
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Citation
Peripheral hypoxia in restless legs syndrome (Willis-Ekbom disease)
Aaro V. Salminen, Ville Rimpilä, Olli Polo
Neurology May 2014, 82 (21) 1856-1861; DOI: 10.1212/WNL.0000000000000454

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Abstract

Objective: A case-control study to measure oxygen and carbon dioxide partial pressures in the legs in order to assess the involvement of peripheral hypoxia or hypercapnia in the pathogenesis of restless legs syndrome (RLS).

Methods: RLS severity was assessed with a standard questionnaire. Suggested immobilization tests were performed twice in 15 patients with RLS and 14 healthy controls. Patients with RLS participated in the tests with and without pramipexole medication. During the tests, peripheral oxygen and carbon dioxide partial pressures were measured noninvasively on the skin of the legs and the chest.

Results: During immobilization, the patients with RLS had lower partial pressure of oxygen in their legs (5.54 vs 7.19 kPa, p < 0.01) but not on the chest (8.75 vs 8.20 kPa, p = 0.355). More severe RLS correlated with high chest-to-foot oxygen gradient (ρ = 0.692, p < 0.01). Carbon dioxide levels did not differ between the groups. Pramipexole corrected the peripheral hypoxia toward the levels observed in the controls (from 5.54 to 6.65 kPa, p < 0.05).

Conclusions: Peripheral hypoxia is associated with the appearance of RLS symptoms. Strong correlation with RLS severity suggests a close pathophysiologic link between peripheral hypoxia and the symptoms of RLS. This is further supported by the simultaneous reversal of hypoxia and discomfort by dopaminergic treatment.

GLOSSARY

IRLSSG=
International Restless Legs Syndrome Study Group;
ptco2=
partial pressure of carbon dioxide;
pto2=
partial pressure of oxygen;
RLS=
restless legs syndrome;
Sao2=
arterial oxyhemoglobin saturation;
SIT=
suggested immobilization test;
tcco2=
transcutaneous carbon dioxide;
tco2=
transcutaneous oxygen

Footnotes

  • Go to Neurology.org for full disclosures. Funding information and disclosures deemed relevant by the authors, if any, are provided at the end of the article.

  • Editorial, page 1850

  • Received November 9, 2013.
  • Accepted in final form February 12, 2014.
  • © 2014 American Academy of Neurology
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  • Peripheral hypoxia in restless legs syndrome (Willis-Ekbom disease)
    • Khichar Purnaram Shubhakaran, Associate Professor Neurology, Department of Neurology, Dr. S. N. Medical College, Jodhpur, India.drkhicharsk@gmail.com
    • Rekha Jakhar Khichar, Associate Professor, Jodhpur, India.
    Submitted June 27, 2014
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