Introduction: In polycythemia vera (PV) patients undergoing phlebotomy, iron deficiency (ID) may develop. ID has been linked to restless legs syndrome (RLS), and in one study, 29.6% of PV patients had RLS. We aimed to evaluate the frequency of RLS in PV and to evaluate factors that might play a role in RLS development among PV and essential thrombocythemia (ET) patients.
Methods: We consecutively included PV cases as the patient group, and ET and ID patients and healthy subjects (HSs) were included as controls. Those with conditions that could lead to RLS were excluded. All subjects were questioned according to the diagnostic criteria of the International Restless Legs Syndrome Study Group.
Results: Twenty-seven PV, 23 ET, and 22 ID patients and 23 HSs were included. RLS was detected in 25.9%, 34.8%, and 45.5% of PV, ET, and ID patients, respectively. None of the HSs had RLS. In univariate analysis, interferon-α and anagrelide use, magnesium levels, and the Leeds assessment of neuropathic symptoms and signs (LANSS) scores had a significant impact on RLS in PV and ET patients ( = 0.014, = 0.032, = 0.036, and = 0.003, respectively).
Conclusion: RLS was more common among PV and ET patients than HSs, which was irrespective to the iron status. RLS was more frequent in ET patients than that observed in PV cases, indicating that ID may not be the only causative factor for RLS development in PV. Further prospective studies are needed to determine the prevalence and risk factors of RLS developing in PV and ET.
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