Associated co-morbidities in a retrospective cohort of orthostatic tremor

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Associated co‑morbidities in a retrospective cohort of orthostatic tremor Louise Bicart‑Sée1 · Jean‑Luc Thibault1 · Aurélia Poujois2 · France Woimant3 · Floriane Bouquet‑Castiglione1 · Pierre Lozeron1,4 · Nathalie Kubis1,4  Received: 1 May 2020 / Revised: 12 August 2020 / Accepted: 12 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020

Abstract Background  Orthostatic tremor (OT) is characterized by tremor in orthostatism. Primary OT is characterized by a high-frequency tremor at surface EMG recording and assumed to be idiopathic, whereas slow-frequency OT is classically associated with neurological pathologies. We report here a retrospective monocentric cohort study of primary (fast OT) and pseudo-OT (slow OT) patients to describe associated neurological and non-neurological co-morbidities. Methods  Between November 2014 and October 2019, 27 patients with OT were selected from the EMG database of the Department of Clinical Physiology in Lariboisière’ s hospital. Patients were classified in primary OT if tremor frequency was ≥ 13 Hz and in pseudo-OT if tremor frequency was